15287997 has 8 divisors (see below), whose sum is σ = 20402656. Its totient is φ = 10182672.

The previous prime is 15287977. The next prime is 15288029. The reversal of 15287997 is 79978251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15287997 - 2⁷ = 15287869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15287917) 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, 3783 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (2550332).

Almost surely, 2^15287997 is an apocalyptic number.

It is an amenable number.

15287997 is a deficient number, since it is larger than the sum of its proper divisors (5114659).

15287997 is a wasteful number, since it uses less digits than its factorization.

15287997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667.

The product of its digits is 317520, while the sum is 48.

The square root of 15287997 is about 3909.9868286223. The cubic root of 15287997 is about 248.1895717121.

The spelling of 15287997 in words is "fifteen million, two hundred eighty-seven thousand, nine hundred ninety-seven".