16991902 has 4 divisors (see below), whose sum is σ = 25487856. Its totient is φ = 8495950.

The previous prime is 16991893. The next prime is 16991927. The reversal of 16991902 is 20919961.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4247974 + ... + 4247977.

It is an arithmetic number, because the mean of its divisors is an integer number (6371964).

Almost surely, 2^16991902 is an apocalyptic number.

16991902 is a deficient number, since it is larger than the sum of its proper divisors (8495954).

16991902 is an equidigital number, since it uses as much as digits as its factorization.

16991902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495953.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 16991902 is about 4122.1234818962. The cubic root of 16991902 is about 257.0873246630.

The spelling of 16991902 in words is "sixteen million, nine hundred ninety-one thousand, nine hundred two".