1157720 has 32 divisors (see below), whose sum is σ = 2639520. Its totient is φ = 456960.

The previous prime is 1157713. The next prime is 1157729. The reversal of 1157720 is 277511.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3980 + ... + 4260.

It is an arithmetic number, because the mean of its divisors is an integer number (82485).

2^1157720 is an apocalyptic number.

1157720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1157720 is an abundant number, since it is smaller than the sum of its proper divisors (1481800).

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

1157720 is a wasteful number, since it uses less digits than its factorization.

1157720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 1157720 is about 1075.9739773805. The cubic root of 1157720 is about 105.0028721814.

It can be divided in two parts, 11577 and 20, that multiplied together give a triangular number (231540 = T₆₈₀).

The spelling of 1157720 in words is "one million, one hundred fifty-seven thousand, seven hundred twenty".