16991396 has 24 divisors (see below), whose sum is σ = 31500000. Its totient is φ = 7997184.

The previous prime is 16991389. The next prime is 16991423. The reversal of 16991396 is 69319961.

It is a happy 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, 12980 + ... + 14228.

It is an arithmetic number, because the mean of its divisors is an integer number (1312500).

Almost surely, 2^16991396 is an apocalyptic number.

It is an amenable number.

16991396 is a deficient number, since it is larger than the sum of its proper divisors (14508604).

16991396 is a wasteful number, since it uses less digits than its factorization.

16991396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1449 counting only the distinct ones).

The product of its digits is 78732, while the sum is 44.

The square root of 16991396 is about 4122.0621053060. The cubic root of 16991396 is about 257.0847727125.

The spelling of 16991396 in words is "sixteen million, nine hundred ninety-one thousand, three hundred ninety-six".