16717990 has 32 divisors (see below), whose sum is σ = 31334400. Its totient is φ = 6415200.

The previous prime is 16717963. The next prime is 16717991. The reversal of 16717990 is 9971761.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16717991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61555 + ... + 61825.

It is an arithmetic number, because the mean of its divisors is an integer number (979200).

Almost surely, 2^16717990 is an apocalyptic number.

16717990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16717990 is a deficient number, since it is larger than the sum of its proper divisors (14616410).

16717990 is a wasteful number, since it uses less digits than its factorization.

16717990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 16717990 is about 4088.7638718811. The cubic root of 16717990 is about 255.6984058171.

The spelling of 16717990 in words is "sixteen million, seven hundred seventeen thousand, nine hundred ninety".