15404994 has 48 divisors (see below), whose sum is σ = 36769824. Its totient is φ = 4660920.

The previous prime is 15404993. The next prime is 15405007. The reversal of 15404994 is 49940451.

It is a happy number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (15404993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23637 + ... + 24279.

It is an arithmetic number, because the mean of its divisors is an integer number (766038).

Almost surely, 2^15404994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15404994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18384912).

15404994 is an abundant number, since it is smaller than the sum of its proper divisors (21364830).

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

15404994 is a wasteful number, since it uses less digits than its factorization.

15404994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 659 counting only the distinct ones).

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

The square root of 15404994 is about 3924.9196170113. The cubic root of 15404994 is about 248.8210840340.

The spelling of 15404994 in words is "fifteen million, four hundred four thousand, nine hundred ninety-four".