1157840 has 40 divisors (see below), whose sum is σ = 2765448. Its totient is φ = 450560.

The previous prime is 1157839. The next prime is 1157851. The reversal of 1157840 is 487511.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 1157776 = 8^2 + 1076^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3104 + ... + 3456.

2^1157840 is an apocalyptic number.

1157840 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 1157840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382724).

1157840 is an abundant number, since it is smaller than the sum of its proper divisors (1607608).

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

1157840 is a wasteful number, since it uses less digits than its factorization.

1157840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 1157840 is about 1076.0297393660. The cubic root of 1157840 is about 105.0064999755.

The spelling of 1157840 in words is "one million, one hundred fifty-seven thousand, eight hundred forty".