399789755850 has 48 divisors (see below), whose sum is σ = 1025667522720. Its totient is φ = 102934372800.

The previous prime is 399789755839. The next prime is 399789755851. The reversal of 399789755850 is 58557987993.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is not an unprimeable number, because it can be changed into a prime (399789755851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45948496 + ... + 45957195.

It is an arithmetic number, because the mean of its divisors is an integer number (21368073390).

Almost surely, 2^399789755850 is an apocalyptic number.

399789755850 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399789755850 is an abundant number, since it is smaller than the sum of its proper divisors (625877766870).

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

399789755850 is a wasteful number, since it uses less digits than its factorization.

399789755850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91905735 (or 91905730 counting only the distinct ones).

The product of its (nonzero) digits is 857304000, while the sum is 75.

The spelling of 399789755850 in words is "three hundred ninety-nine billion, seven hundred eighty-nine million, seven hundred fifty-five thousand, eight hundred fifty".