398878778935 has 32 divisors (see below), whose sum is σ = 608116948992. Its totient is φ = 244332685440.

The previous prime is 398878778849. The next prime is 398878778959. The reversal of 398878778935 is 539877878893.

It is a happy number.

It is not a de Polignac number, because 398878778935 - 2¹¹ = 398878776887 is a prime.

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, 14125519 + ... + 14153728.

It is an arithmetic number, because the mean of its divisors is an integer number (19003654656).

Almost surely, 2^398878778935 is an apocalyptic number.

398878778935 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

398878778935 is a deficient number, since it is larger than the sum of its proper divisors (209238170057).

398878778935 is a wasteful number, since it uses less digits than its factorization.

398878778935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28279303.

The product of its digits is 5120962560, while the sum is 82.

The spelling of 398878778935 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, seven hundred seventy-eight thousand, nine hundred thirty-five".