398878155478 has 16 divisors (see below), whose sum is σ = 653744136960. Its totient is φ = 181020911400.

The previous prime is 398878155469. The next prime is 398878155517. The reversal of 398878155478 is 874551878893.

It is a self number, because there is not a number n which added to its sum of digits gives 398878155478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14352858 + ... + 14380621.

It is an arithmetic number, because the mean of its divisors is an integer number (40859008560).

Almost surely, 2^398878155478 is an apocalyptic number.

398878155478 is a deficient number, since it is larger than the sum of its proper divisors (254865981482).

398878155478 is a wasteful number, since it uses less digits than its factorization.

398878155478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28734123.

The product of its digits is 541900800, while the sum is 73.

The spelling of 398878155478 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, one hundred fifty-five thousand, four hundred seventy-eight".