399740544 has 192 divisors, whose sum is σ = 1384344000. Its totient is φ = 108158976.

The previous prime is 399740531. The next prime is 399740569. The reversal of 399740544 is 445047993.

It is a happy number.

399740544 is a `hidden beast` number, since 39 + 9 + 74 + 0 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 399740544.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151912 + ... + 154520.

It is an arithmetic number, because the mean of its divisors is an integer number (7210125).

Almost surely, 2^399740544 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 399740544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692172000).

399740544 is an abundant number, since it is smaller than the sum of its proper divisors (984603456).

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

399740544 is a wasteful number, since it uses less digits than its factorization.

399740544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2640 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 399740544 is about 19993.5125478241. The cubic root of 399740544 is about 736.6469579252.

The spelling of 399740544 in words is "three hundred ninety-nine million, seven hundred forty thousand, five hundred forty-four".