399649629 has 16 divisors (see below), whose sum is σ = 564025280. Its totient is φ = 251009280.

The previous prime is 399649619. The next prime is 399649631. The reversal of 399649629 is 926946993.

It is not a de Polignac number, because 399649629 - 2¹¹ = 399647581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399649619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9052 + ... + 29685.

It is an arithmetic number, because the mean of its divisors is an integer number (35251580).

Almost surely, 2^399649629 is an apocalyptic number.

It is an amenable number.

399649629 is a deficient number, since it is larger than the sum of its proper divisors (164375651).

399649629 is a wasteful number, since it uses less digits than its factorization.

399649629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38940.

The product of its digits is 5668704, while the sum is 57.

The square root of 399649629 is about 19991.2388060370. The cubic root of 399649629 is about 736.5911072515.

The spelling of 399649629 in words is "three hundred ninety-nine million, six hundred forty-nine thousand, six hundred twenty-nine".