16399958 has 4 divisors (see below), whose sum is σ = 24599940. Its totient is φ = 8199978.

The previous prime is 16399939. The next prime is 16399967. The reversal of 16399958 is 85999361.

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

It is a super-3 number, since 3×16399958³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099988 + ... + 4099991.

It is an arithmetic number, because the mean of its divisors is an integer number (6149985).

Almost surely, 2^16399958 is an apocalyptic number.

16399958 is a deficient number, since it is larger than the sum of its proper divisors (8199982).

16399958 is an equidigital number, since it uses as much as digits as its factorization.

16399958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8199981.

The product of its digits is 524880, while the sum is 50.

The square root of 16399958 is about 4049.6861606796. The cubic root of 16399958 is about 254.0666016680.

The spelling of 16399958 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred fifty-eight".