399845652 has 48 divisors (see below), whose sum is σ = 987604800. Its totient is φ = 125556480.

The previous prime is 399845651. The next prime is 399845669. The reversal of 399845652 is 256548993.

It is a junction number, because it is equal to n+sod(n) for n = 399845595 and 399845604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399845651) 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, 36424 + ... + 46112.

It is an arithmetic number, because the mean of its divisors is an integer number (20575100).

Almost surely, 2^399845652 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 399845652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493802400).

399845652 is an abundant number, since it is smaller than the sum of its proper divisors (587759148).

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

399845652 is a wasteful number, since it uses less digits than its factorization.

399845652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9896 (or 9894 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The square root of 399845652 is about 19996.1409276890. The cubic root of 399845652 is about 736.7115170535.

The spelling of 399845652 in words is "three hundred ninety-nine million, eight hundred forty-five thousand, six hundred fifty-two".