399049530 has 96 divisors (see below), whose sum is σ = 1059718464. Its totient is φ = 96096000.

The previous prime is 399049493. The next prime is 399049531. The reversal of 399049530 is 35940993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399049531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 765670 + ... + 766190.

It is an arithmetic number, because the mean of its divisors is an integer number (11038734).

Almost surely, 2^399049530 is an apocalyptic number.

399049530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399049530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529859232).

399049530 is an abundant number, since it is smaller than the sum of its proper divisors (660668934).

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

399049530 is a wasteful number, since it uses less digits than its factorization.

399049530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 399049530 is about 19976.2241176855. The cubic root of 399049530 is about 736.2222433070. Note that the first 4 decimals are identical.

The spelling of 399049530 in words is "three hundred ninety-nine million, forty-nine thousand, five hundred thirty".