399993970005 has 36 divisors (see below), whose sum is σ = 806518458252. Its totient is φ = 182854385280.

The previous prime is 399993969989. The next prime is 399993970031. The reversal of 399993970005 is 500079399993.

It can be written as a sum of positive squares in 2 ways, for example, as 254990661156 + 145003308849 = 504966^2 + 380793^2 .

It is not a de Polignac number, because 399993970005 - 2⁴ = 399993969989 is a prime.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90699376 + ... + 90703785.

It is an arithmetic number, because the mean of its divisors is an integer number (22403290507).

Almost surely, 2^399993970005 is an apocalyptic number.

399993970005 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399993970005 is an abundant number, since it is smaller than the sum of its proper divisors (406524488247).

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

399993970005 is a wasteful number, since it uses less digits than its factorization.

399993970005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181403186 (or 181403176 counting only the distinct ones).

The product of its (nonzero) digits is 18600435, while the sum is 63.

The spelling of 399993970005 in words is "three hundred ninety-nine billion, nine hundred ninety-three million, nine hundred seventy thousand, five".