398626440 has 32 divisors (see below), whose sum is σ = 1195879680. Its totient is φ = 106300352.

The previous prime is 398626439. The next prime is 398626451. The reversal of 398626440 is 44626893.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 398626392 and 398626401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660824 + ... + 1661063.

It is an arithmetic number, because the mean of its divisors is an integer number (37371240).

Almost surely, 2^398626440 is an apocalyptic number.

398626440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398626440 is an abundant number, since it is smaller than the sum of its proper divisors (797253240).

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

398626440 is a wasteful number, since it uses less digits than its factorization.

398626440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321901 (or 3321897 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 398626440 is about 19965.6314701038. The cubic root of 398626440 is about 735.9619594784.

The spelling of 398626440 in words is "three hundred ninety-eight million, six hundred twenty-six thousand, four hundred forty".