399200029521 has 32 divisors (see below), whose sum is σ = 537816412800. Its totient is φ = 263373809664.

The previous prime is 399200029507. The next prime is 399200029523. The reversal of 399200029521 is 125920002993.

It is not a de Polignac number, because 399200029521 - 2⁵ = 399200029489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399200029523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169366675 + ... + 169369031.

It is an arithmetic number, because the mean of its divisors is an integer number (16806762900).

Almost surely, 2^399200029521 is an apocalyptic number.

It is an amenable number.

399200029521 is a deficient number, since it is larger than the sum of its proper divisors (138616383279).

399200029521 is a wasteful number, since it uses less digits than its factorization.

399200029521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 399200029521 in words is "three hundred ninety-nine billion, two hundred million, twenty-nine thousand, five hundred twenty-one".