399636396 has 48 divisors (see below), whose sum is σ = 1046381280. Its totient is φ = 131889600.

The previous prime is 399636379. The next prime is 399636397. The reversal of 399636396 is 693636993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (399636397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7411 + ... + 29226.

It is an arithmetic number, because the mean of its divisors is an integer number (21799610).

Almost surely, 2^399636396 is an apocalyptic number.

399636396 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399636396 is an abundant number, since it is smaller than the sum of its proper divisors (646744884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399636396 is a wasteful number, since it uses less digits than its factorization.

399636396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36751 (or 36743 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 54.

The square root of 399636396 is about 19990.9078333126. The cubic root of 399636396 is about 736.5829772821.

The spelling of 399636396 in words is "three hundred ninety-nine million, six hundred thirty-six thousand, three hundred ninety-six".