398720761 has 4 divisors (see below), whose sum is σ = 405478800. Its totient is φ = 391962724.

The previous prime is 398720753. The next prime is 398720767. The reversal of 398720761 is 167027893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167027893 = 163 ⋅1024711.

It is not a de Polignac number, because 398720761 - 2³ = 398720753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398720767) 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, 3378931 + ... + 3379048.

It is an arithmetic number, because the mean of its divisors is an integer number (101369700).

Almost surely, 2^398720761 is an apocalyptic number.

It is an amenable number.

398720761 is a deficient number, since it is larger than the sum of its proper divisors (6758039).

398720761 is an equidigital number, since it uses as much as digits as its factorization.

398720761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758038.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 398720761 is about 19967.9934144621. The cubic root of 398720761 is about 736.0200014502.

The spelling of 398720761 in words is "three hundred ninety-eight million, seven hundred twenty thousand, seven hundred sixty-one".