16391964 has 24 divisors (see below), whose sum is σ = 39181968. Its totient is φ = 5330560.

The previous prime is 16391941. The next prime is 16391971. The reversal of 16391964 is 46919361.

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, 16167 + ... + 17150.

It is an arithmetic number, because the mean of its divisors is an integer number (1632582).

Almost surely, 2^16391964 is an apocalyptic number.

It is an amenable number.

16391964 is an abundant number, since it is smaller than the sum of its proper divisors (22790004).

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

16391964 is a wasteful number, since it uses less digits than its factorization.

16391964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33365 (or 33363 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 16391964 is about 4048.6990503123. The cubic root of 16391964 is about 254.0253141943.

The spelling of 16391964 in words is "sixteen million, three hundred ninety-one thousand, nine hundred sixty-four".