1157640 has 64 divisors (see below), whose sum is σ = 3792960. Its totient is φ = 280320.

The previous prime is 1157627. The next prime is 1157641. The reversal of 1157640 is 467511.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1157640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 882 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (59265).

2^1157640 is an apocalyptic number.

1157640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1157640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1896480).

1157640 is an abundant number, since it is smaller than the sum of its proper divisors (2635320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1157640 is a wasteful number, since it uses less digits than its factorization.

1157640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1157640 is about 1075.9368011180. The cubic root of 1157640 is about 105.0004535128. Note that the first 3 decimals are identical.

It can be divided in two parts, 1 and 157640, that added together give a triangular number (157641 = T₅₆₁).

The spelling of 1157640 in words is "one million, one hundred fifty-seven thousand, six hundred forty".