399384972 has 192 divisors, whose sum is σ = 1252392960. Its totient is φ = 107604288.

The previous prime is 399384943. The next prime is 399385001. The reversal of 399384972 is 279483993.

It is an interprime number because it is at equal distance from previous prime (399384943) and next prime (399385001).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1790853 + ... + 1791075.

It is an arithmetic number, because the mean of its divisors is an integer number (6522880).

Almost surely, 2^399384972 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 399384972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (626196480).

399384972 is an abundant number, since it is smaller than the sum of its proper divisors (853007988).

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

399384972 is a wasteful number, since it uses less digits than its factorization.

399384972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 361 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 399384972 is about 19984.6183851481. The cubic root of 399384972 is about 736.4284755974.

The spelling of 399384972 in words is "three hundred ninety-nine million, three hundred eighty-four thousand, nine hundred seventy-two".