15897840 has 80 divisors (see below), whose sum is σ = 56329728. Its totient is φ = 3633408.

The previous prime is 15897793. The next prime is 15897859. The reversal of 15897840 is 4879851.

15897840 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (42).

15897840 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 15897792 and 15897801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3052 + ... + 6411.

Almost surely, 2^15897840 is an apocalyptic number.

15897840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15897840 is an abundant number, since it is smaller than the sum of its proper divisors (40431888).

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

15897840 is a wasteful number, since it uses less digits than its factorization.

15897840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486 (or 9480 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 15897840 is about 3987.2095505504. The cubic root of 15897840 is about 251.4467580804.

The spelling of 15897840 in words is "fifteen million, eight hundred ninety-seven thousand, eight hundred forty".