399538542 has 64 divisors (see below), whose sum is σ = 887927040. Its totient is φ = 119073024.

The previous prime is 399538541. The next prime is 399538547. The reversal of 399538542 is 245835993.

It is a junction number, because it is equal to n+sod(n) for n = 399538491 and 399538500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399538541) 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 31 ways as a sum of consecutive naturals, for example, 465778 + ... + 466634.

It is an arithmetic number, because the mean of its divisors is an integer number (13873860).

Almost surely, 2^399538542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399538542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443963520).

399538542 is an abundant number, since it is smaller than the sum of its proper divisors (488388498).

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

399538542 is a wasteful number, since it uses less digits than its factorization.

399538542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057.

The product of its digits is 1166400, while the sum is 48.

The square root of 399538542 is about 19988.4602208374. The cubic root of 399538542 is about 736.5228530666.

The spelling of 399538542 in words is "three hundred ninety-nine million, five hundred thirty-eight thousand, five hundred forty-two".