399263325552 has 960 divisors, whose sum is σ = 1500377303040. Its totient is φ = 98964467712.

The previous prime is 399263325547. The next prime is 399263325557. The reversal of 399263325552 is 255523362993.

399263325552 is a `hidden beast` number, since 3 + 9 + 9 + 2 + 63 + 3 + 25 + 552 = 666.

It is an interprime number because it is at equal distance from previous prime (399263325547) and next prime (399263325557).

It is a super-2 number, since 2×399263325552² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399263325557) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1518111373 + ... + 1518111635.

It is an arithmetic number, because the mean of its divisors is an integer number (1562893024).

Almost surely, 2^399263325552 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 399263325552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750188651520).

399263325552 is an abundant number, since it is smaller than the sum of its proper divisors (1101113977488).

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

399263325552 is a wasteful number, since it uses less digits than its factorization.

399263325552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 384 counting only the distinct ones).

The product of its digits is 13122000, while the sum is 54.

The spelling of 399263325552 in words is "three hundred ninety-nine billion, two hundred sixty-three million, three hundred twenty-five thousand, five hundred fifty-two".