399000744 has 96 divisors (see below), whose sum is σ = 1151153640. Its totient is φ = 124416000.

The previous prime is 399000737. The next prime is 399000769. The reversal of 399000744 is 447000993.

It can be written as a sum of positive squares in 4 ways, for example, as 196280100 + 202720644 = 14010^2 + 14238^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 399000699 and 399000708.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220644 + ... + 222444.

Almost surely, 2^399000744 is an apocalyptic number.

399000744 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399000744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (575576820).

399000744 is an abundant number, since it is smaller than the sum of its proper divisors (752152896).

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

399000744 is a wasteful number, since it uses less digits than its factorization.

399000744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 399000744 is about 19975.0029787232. The cubic root of 399000744 is about 736.1922396780.

The spelling of 399000744 in words is "three hundred ninety-nine million, seven hundred forty-four", and thus it is an aban number.