398207279 has 4 divisors (see below), whose sum is σ = 398536776. Its totient is φ = 397877784.

The previous prime is 398207273. The next prime is 398207281. The reversal of 398207279 is 972702893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972702893 = 401 ⋅2425693.

It is a cyclic number.

It is not a de Polignac number, because 398207279 - 2⁸ = 398207023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398207273) 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, 162929 + ... + 165354.

It is an arithmetic number, because the mean of its divisors is an integer number (99634194).

Almost surely, 2^398207279 is an apocalyptic number.

398207279 is a deficient number, since it is larger than the sum of its proper divisors (329497).

398207279 is a wasteful number, since it uses less digits than its factorization.

398207279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329496.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 398207279 is about 19955.1316457697. The cubic root of 398207279 is about 735.7039110827.

The spelling of 398207279 in words is "three hundred ninety-eight million, two hundred seven thousand, two hundred seventy-nine".