398625919 has 4 divisors (see below), whose sum is σ = 402153696. Its totient is φ = 395098144.

The previous prime is 398625883. The next prime is 398625973. The reversal of 398625919 is 919526893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919526893 = 71 ⋅12951083.

It is a cyclic number.

It is not a de Polignac number, because 398625919 - 2⁹ = 398625407 is a prime.

It is a super-2 number, since 2×398625919² = 317805246597189122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398625119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763719 + ... + 1763944.

It is an arithmetic number, because the mean of its divisors is an integer number (100538424).

Almost surely, 2^398625919 is an apocalyptic number.

398625919 is a deficient number, since it is larger than the sum of its proper divisors (3527777).

398625919 is a wasteful number, since it uses less digits than its factorization.

398625919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3527776.

The product of its digits is 1049760, while the sum is 52.

The square root of 398625919 is about 19965.6184226785. The cubic root of 398625919 is about 735.9616388471.

The spelling of 398625919 in words is "three hundred ninety-eight million, six hundred twenty-five thousand, nine hundred nineteen".