398255634 has 72 divisors (see below), whose sum is σ = 1062851868. Its totient is φ = 107089920.

The previous prime is 398255629. The next prime is 398255653. The reversal of 398255634 is 436552893.

398255634 is a `hidden beast` number, since 3 + 9 + 8 + 2 + 5 + 5 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 351675009 + 46580625 = 18753^2 + 6825^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 398255634.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1714 + ... + 28274.

Almost surely, 2^398255634 is an apocalyptic number.

398255634 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398255634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531425934).

398255634 is an abundant number, since it is smaller than the sum of its proper divisors (664596234).

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

398255634 is a wasteful number, since it uses less digits than its factorization.

398255634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26600 (or 26590 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 398255634 is about 19956.3432020999. The cubic root of 398255634 is about 735.7336891444.

The spelling of 398255634 in words is "three hundred ninety-eight million, two hundred fifty-five thousand, six hundred thirty-four".