1165256140 has 24 divisors (see below), whose sum is σ = 2503947600. Its totient is φ = 455262528.

The previous prime is 1165256129. The next prime is 1165256167. The reversal of 1165256140 is 416525611.

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, 676615 + ... + 678334.

It is an arithmetic number, because the mean of its divisors is an integer number (104331150).

Almost surely, 2^1165256140 is an apocalyptic number.

1165256140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165256140 is an abundant number, since it is smaller than the sum of its proper divisors (1338691460).

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

1165256140 is a wasteful number, since it uses less digits than its factorization.

1165256140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355001 (or 1354999 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1165256140 is about 34135.8483122948. The cubic root of 1165256140 is about 1052.3021716753.

The spelling of 1165256140 in words is "one billion, one hundred sixty-five million, two hundred fifty-six thousand, one hundred forty".