398429939 has 4 divisors (see below), whose sum is σ = 400452624. Its totient is φ = 396407256.

The previous prime is 398429929. The next prime is 398429947. The reversal of 398429939 is 939924893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939924893 = 397 ⋅2367569.

It is a cyclic number.

It is not a de Polignac number, because 398429939 - 2⁸ = 398429683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398429929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011047 + ... + 1011440.

It is an arithmetic number, because the mean of its divisors is an integer number (100113156).

Almost surely, 2^398429939 is an apocalyptic number.

398429939 is a deficient number, since it is larger than the sum of its proper divisors (2022685).

398429939 is a wasteful number, since it uses less digits than its factorization.

398429939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022684.

The product of its digits is 3779136, while the sum is 56.

The square root of 398429939 is about 19960.7098821660. The cubic root of 398429939 is about 735.8410099580.

The spelling of 398429939 in words is "three hundred ninety-eight million, four hundred twenty-nine thousand, nine hundred thirty-nine".