399982649 has 4 divisors (see below), whose sum is σ = 436344720. Its totient is φ = 363620580.

The previous prime is 399982619. The next prime is 399982733. The reversal of 399982649 is 946289993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399982649 - 2¹⁶ = 399917113 is a prime.

It is a super-2 number, since 2×399982649² = 319972239002114402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399982619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18181019 + ... + 18181040.

It is an arithmetic number, because the mean of its divisors is an integer number (109086180).

Almost surely, 2^399982649 is an apocalyptic number.

It is an amenable number.

399982649 is a deficient number, since it is larger than the sum of its proper divisors (36362071).

399982649 is a wasteful number, since it uses less digits than its factorization.

399982649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36362070.

The product of its digits is 7558272, while the sum is 59.

The square root of 399982649 is about 19999.5662202959. The cubic root of 399982649 is about 736.7956459689.

The spelling of 399982649 in words is "three hundred ninety-nine million, nine hundred eighty-two thousand, six hundred forty-nine".