16439690 has 8 divisors (see below), whose sum is σ = 29591460. Its totient is φ = 6575872.

The previous prime is 16439677. The next prime is 16439743. The reversal of 16439690 is 9693461.

It can be written as a sum of positive squares in 2 ways, for example, as 15531481 + 908209 = 3941^2 + 953^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16439690² = 540526814592200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821975 + ... + 821994.

Almost surely, 2^16439690 is an apocalyptic number.

16439690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16439690 is a deficient number, since it is larger than the sum of its proper divisors (13151770).

16439690 is a wasteful number, since it uses less digits than its factorization.

16439690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643976.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 16439690 is about 4054.5887584316. The cubic root of 16439690 is about 254.2716109972.

The spelling of 16439690 in words is "sixteen million, four hundred thirty-nine thousand, six hundred ninety".