398779438 has 8 divisors (see below), whose sum is σ = 633355632. Its totient is φ = 187660896.

The previous prime is 398779399. The next prime is 398779453. The reversal of 398779438 is 834977893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5864370 + ... + 5864437.

It is an arithmetic number, because the mean of its divisors is an integer number (79169454).

Almost surely, 2^398779438 is an apocalyptic number.

398779438 is a deficient number, since it is larger than the sum of its proper divisors (234576194).

398779438 is a wasteful number, since it uses less digits than its factorization.

398779438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11728826.

The product of its digits is 9144576, while the sum is 58.

The square root of 398779438 is about 19969.4626367361. The cubic root of 398779438 is about 736.0561046846.

The spelling of 398779438 in words is "three hundred ninety-eight million, seven hundred seventy-nine thousand, four hundred thirty-eight".