398178038180015 has 32 divisors (see below), whose sum is σ = 485344297218816. Its totient is φ = 313550451475200.

The previous prime is 398178038179991. The next prime is 398178038180063. The reversal of 398178038180015 is 510081830871893.

It is not a de Polignac number, because 398178038180015 - 2¹² = 398178038175919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398178038180015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 889657040 + ... + 890104490.

It is an arithmetic number, because the mean of its divisors is an integer number (15167009288088).

Almost surely, 2^{398178038180015} is an apocalyptic number.

398178038180015 is a deficient number, since it is larger than the sum of its proper divisors (87166259038801).

398178038180015 is a wasteful number, since it uses less digits than its factorization.

398178038180015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455399.

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 398178038180015 in words is "three hundred ninety-eight trillion, one hundred seventy-eight billion, thirty-eight million, one hundred eighty thousand, fifteen".