398349128 has 8 divisors (see below), whose sum is σ = 746904630. Its totient is φ = 199174560.

The previous prime is 398349097. The next prime is 398349139. The reversal of 398349128 is 821943893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 370870564 + 27478564 = 19258^2 + 5242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24896813 + ... + 24896828.

Almost surely, 2^398349128 is an apocalyptic number.

It is an amenable number.

398349128 is a deficient number, since it is larger than the sum of its proper divisors (348555502).

398349128 is a wasteful number, since it uses less digits than its factorization.

398349128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49793647 (or 49793643 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 398349128 is about 19958.6855278598. The cubic root of 398349128 is about 735.7912579500.

The spelling of 398349128 in words is "three hundred ninety-eight million, three hundred forty-nine thousand, one hundred twenty-eight".