15963397 has 4 divisors (see below), whose sum is σ = 16104780. Its totient is φ = 15822016.

The previous prime is 15963383. The next prime is 15963407. The reversal of 15963397 is 79336951.

It is a happy number.

15963397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3389281 + 12574116 = 1841^2 + 3546^2 .

It is a cyclic number.

It is not a de Polignac number, because 15963397 - 2²³ = 7574789 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 (15963347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70522 + ... + 70747.

It is an arithmetic number, because the mean of its divisors is an integer number (4026195).

Almost surely, 2^15963397 is an apocalyptic number.

It is an amenable number.

15963397 is a deficient number, since it is larger than the sum of its proper divisors (141383).

15963397 is a wasteful number, since it uses less digits than its factorization.

15963397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141382.

The product of its digits is 153090, while the sum is 43.

The square root of 15963397 is about 3995.4220052455. The cubic root of 15963397 is about 251.7919095541.

The spelling of 15963397 in words is "fifteen million, nine hundred sixty-three thousand, three hundred ninety-seven".