398780831634 has 32 divisors (see below), whose sum is σ = 800673933696. Its totient is φ = 132409157760.

The previous prime is 398780831633. The next prime is 398780831671. The reversal of 398780831634 is 436138087893.

It is not an unprimeable number, because it can be changed into a prime (398780831633) 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 15 ways as a sum of consecutive naturals, for example, 1616574 + ... + 1846854.

It is an arithmetic number, because the mean of its divisors is an integer number (25021060428).

Almost surely, 2^398780831634 is an apocalyptic number.

398780831634 is an abundant number, since it is smaller than the sum of its proper divisors (401893102062).

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

398780831634 is a wasteful number, since it uses less digits than its factorization.

398780831634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231410.

The product of its (nonzero) digits is 20901888, while the sum is 60.

The spelling of 398780831634 in words is "three hundred ninety-eight billion, seven hundred eighty million, eight hundred thirty-one thousand, six hundred thirty-four".