399748608 has 360 divisors, whose sum is σ = 1449697392. Its totient is φ = 107495424.

The previous prime is 399748603. The next prime is 399748637. The reversal of 399748608 is 806847993.

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 (399748603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23514616 + ... + 23514632.

Almost surely, 2^399748608 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 399748608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724848696).

399748608 is an abundant number, since it is smaller than the sum of its proper divisors (1049948784).

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

399748608 is an frugal number, since it uses more digits than its factorization.

399748608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 399748608 is about 19993.7142122218. The cubic root of 399748608 is about 736.6519113725.

399748608 divided by its product of nonzero digits (2612736) gives a triangular number (153 = T₁₇).

The spelling of 399748608 in words is "three hundred ninety-nine million, seven hundred forty-eight thousand, six hundred eight".