15440997 has 16 divisors (see below), whose sum is σ = 24187968. Its totient is φ = 8638080.

The previous prime is 15440989. The next prime is 15441001. The reversal of 15440997 is 79904451.

It is not a de Polignac number, because 15440997 - 2³ = 15440989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15440497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17568 + ... + 18425.

It is an arithmetic number, because the mean of its divisors is an integer number (1511748).

Almost surely, 2^15440997 is an apocalyptic number.

It is an amenable number.

15440997 is a deficient number, since it is larger than the sum of its proper divisors (8746971).

15440997 is a wasteful number, since it uses less digits than its factorization.

15440997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36020.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 15440997 is about 3929.5034037395. The cubic root of 15440997 is about 249.0147730788.

The spelling of 15440997 in words is "fifteen million, four hundred forty thousand, nine hundred ninety-seven".