398632144 has 20 divisors (see below), whose sum is σ = 798983460. Its totient is φ = 192442880.

The previous prime is 398632139. The next prime is 398632177. The reversal of 398632144 is 441236893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77792400 + 320839744 = 8820^2 + 17912^2 .

It is a junction number, because it is equal to n+sod(n) for n = 398632097 and 398632106.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 429097 + ... + 430024.

It is an arithmetic number, because the mean of its divisors is an integer number (39949173).

Almost surely, 2^398632144 is an apocalyptic number.

It is an amenable number.

398632144 is an abundant number, since it is smaller than the sum of its proper divisors (400351316).

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

398632144 is a wasteful number, since it uses less digits than its factorization.

398632144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859158 (or 859152 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 398632144 is about 19965.7743150623. The cubic root of 398632144 is about 735.9654697883.

The spelling of 398632144 in words is "three hundred ninety-eight million, six hundred thirty-two thousand, one hundred forty-four".