399548864 has 112 divisors (see below), whose sum is σ = 940917600. Its totient is φ = 165949440.

The previous prime is 399548861. The next prime is 399548867. The reversal of 399548864 is 468845993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399548861) and next prime (399548867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399548861) 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, 1363502 + ... + 1363794.

It is an arithmetic number, because the mean of its divisors is an integer number (8401050).

Almost surely, 2^399548864 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 399548864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (470458800).

399548864 is an abundant number, since it is smaller than the sum of its proper divisors (541368736).

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

399548864 is a wasteful number, since it uses less digits than its factorization.

399548864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 468 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 56.

The square root of 399548864 is about 19988.7184181478. The cubic root of 399548864 is about 736.5291956532.

The spelling of 399548864 in words is "three hundred ninety-nine million, five hundred forty-eight thousand, eight hundred sixty-four".