15949404 has 18 divisors (see below), whose sum is σ = 40316640. Its totient is φ = 5316456.

The previous prime is 15949399. The next prime is 15949421. The reversal of 15949404 is 40494951.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 443039 = 15949404 / (1 + 5 + 9 + 4 + 9 + 4 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221484 + ... + 221555.

Almost surely, 2^15949404 is an apocalyptic number.

It is an amenable number.

15949404 is an abundant number, since it is smaller than the sum of its proper divisors (24367236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15949404 is a wasteful number, since it uses less digits than its factorization.

15949404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443049 (or 443044 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 15949404 is about 3993.6704921663. The cubic root of 15949404 is about 251.7183171525.

The spelling of 15949404 in words is "fifteen million, nine hundred forty-nine thousand, four hundred four".