16391004 has 24 divisors (see below), whose sum is σ = 43709568. Its totient is φ = 4683120.

The previous prime is 16390993. The next prime is 16391017. The reversal of 16391004 is 40019361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97482 + ... + 97649.

It is an arithmetic number, because the mean of its divisors is an integer number (1821232).

Almost surely, 2^16391004 is an apocalyptic number.

16391004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16391004 is an abundant number, since it is smaller than the sum of its proper divisors (27318564).

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

16391004 is a wasteful number, since it uses less digits than its factorization.

16391004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195145 (or 195143 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16391004 is about 4048.5804919749. The cubic root of 16391004 is about 254.0203550761.

The spelling of 16391004 in words is "sixteen million, three hundred ninety-one thousand, four".