399038136 has 64 divisors (see below), whose sum is σ = 1145614080. Its totient is φ = 113460480.

The previous prime is 399038099. The next prime is 399038137. The reversal of 399038136 is 631830993.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399038137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29820 + ... + 41076.

It is an arithmetic number, because the mean of its divisors is an integer number (17900220).

Almost surely, 2^399038136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399038136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572807040).

399038136 is an abundant number, since it is smaller than the sum of its proper divisors (746575944).

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

399038136 is a wasteful number, since it uses less digits than its factorization.

399038136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11484 (or 11480 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 399038136 is about 19975.9389266187. The cubic root of 399038136 is about 736.2152361601.

The spelling of 399038136 in words is "three hundred ninety-nine million, thirty-eight thousand, one hundred thirty-six".