15887397 has 8 divisors (see below), whose sum is σ = 21214080. Its totient is φ = 10576160.

The previous prime is 15887387. The next prime is 15887413. The reversal of 15887397 is 79378851.

15887397 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 15887397 - 2⁴ = 15887381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15887317) 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, 1197 + ... + 5762.

It is an arithmetic number, because the mean of its divisors is an integer number (2651760).

Almost surely, 2^15887397 is an apocalyptic number.

It is an amenable number.

15887397 is a deficient number, since it is larger than the sum of its proper divisors (5326683).

15887397 is an equidigital number, since it uses as much as digits as its factorization.

15887397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7723.

The product of its digits is 423360, while the sum is 48.

The square root of 15887397 is about 3985.8997729496. The cubic root of 15887397 is about 251.3916890969.

The spelling of 15887397 in words is "fifteen million, eight hundred eighty-seven thousand, three hundred ninety-seven".