398831923447 has 4 divisors (see below), whose sum is σ = 399942876240. Its totient is φ = 397720970656.

The previous prime is 398831923429. The next prime is 398831923471. The reversal of 398831923447 is 744329138893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744329138893 = 48473 ⋅15355541.

It is a cyclic number.

It is not a de Polignac number, because 398831923447 - 2⁷ = 398831923319 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 (398831923487) 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, 555475858 + ... + 555476575.

It is an arithmetic number, because the mean of its divisors is an integer number (99985719060).

Almost surely, 2^398831923447 is an apocalyptic number.

398831923447 is a deficient number, since it is larger than the sum of its proper divisors (1110952793).

398831923447 is a wasteful number, since it uses less digits than its factorization.

398831923447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110952792.

The product of its digits is 31352832, while the sum is 61.

The spelling of 398831923447 in words is "three hundred ninety-eight billion, eight hundred thirty-one million, nine hundred twenty-three thousand, four hundred forty-seven".