399974057280 has 336 divisors, whose sum is σ = 1573013205504. Its totient is φ = 91379957760.

The previous prime is 399974057279. The next prime is 399974057311. The reversal of 399974057280 is 82750479993.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67754809 + ... + 67760711.

Almost surely, 2^399974057280 is an apocalyptic number.

399974057280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399974057280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786506602752).

399974057280 is an abundant number, since it is smaller than the sum of its proper divisors (1173039148224).

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

399974057280 is a wasteful number, since it uses less digits than its factorization.

399974057280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9294 (or 9281 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 63.

The spelling of 399974057280 in words is "three hundred ninety-nine billion, nine hundred seventy-four million, fifty-seven thousand, two hundred eighty".