16217980 has 24 divisors (see below), whose sum is σ = 34151040. Its totient is φ = 6469440.

The previous prime is 16217969. The next prime is 16217987. The reversal of 16217980 is 8971261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16217987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8341 + ... + 10099.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^16217980 is an apocalyptic number.

16217980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16217980 is an abundant number, since it is smaller than the sum of its proper divisors (17933060).

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

16217980 is a wasteful number, since it uses less digits than its factorization.

16217980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2227 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 16217980 is about 4027.1553235504. The cubic root of 16217980 is about 253.1233755929.

The spelling of 16217980 in words is "sixteen million, two hundred seventeen thousand, nine hundred eighty".