15688401 has 8 divisors (see below), whose sum is σ = 20936544. Its totient is φ = 10449600.

The previous prime is 15688397. The next prime is 15688403. The reversal of 15688401 is 10488651.

15688401 is a nontrivial binomial coefficient, being equal to C(5602, 2).

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

It is not a de Polignac number, because 15688401 - 2² = 15688397 is a prime.

It is a super-2 number, since 2×15688401² = 492251851873602, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15688403) 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, 4201 + ... + 7001.

It is an arithmetic number, because the mean of its divisors is an integer number (2617068).

Almost surely, 2^15688401 is an apocalyptic number.

15688401 is the 5601-st triangular number and also the 2801-st hexagonal number.

It is an amenable number.

15688401 is a deficient number, since it is larger than the sum of its proper divisors (5248143).

15688401 is a wasteful number, since it uses less digits than its factorization.

15688401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 15688401 is about 3960.8586190370. The cubic root of 15688401 is about 250.3376823438.

The spelling of 15688401 in words is "fifteen million, six hundred eighty-eight thousand, four hundred one".