1555315640 has 32 divisors (see below), whose sum is σ = 3522960000. Its totient is φ = 617948544.

The previous prime is 1555315639. The next prime is 1555315667. The reversal of 1555315640 is 465135551.

It is a self number, because there is not a number n which added to its sum of digits gives 1555315640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124520 + ... + 136439.

It is an arithmetic number, because the mean of its divisors is an integer number (110092500).

Almost surely, 2^1555315640 is an apocalyptic number.

1555315640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555315640 is an abundant number, since it is smaller than the sum of its proper divisors (1967644360).

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

1555315640 is a wasteful number, since it uses less digits than its factorization.

1555315640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261119 (or 261115 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 1555315640 is about 39437.4902852603. The cubic root of 1555315640 is about 1158.6159771711.

The spelling of 1555315640 in words is "one billion, five hundred fifty-five million, three hundred fifteen thousand, six hundred forty".