398763961 has 4 divisors (see below), whose sum is σ = 400768000. Its totient is φ = 396759924.

The previous prime is 398763931. The next prime is 398763973. The reversal of 398763961 is 169367893.

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.

It is a cyclic number.

It is not a de Polignac number, because 398763961 - 2²³ = 390375353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398763899 and 398763908.

It is not an unprimeable number, because it can be changed into a prime (398763901) 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, 1001721 + ... + 1002118.

It is an arithmetic number, because the mean of its divisors is an integer number (100192000).

Almost surely, 2^398763961 is an apocalyptic number.

It is an amenable number.

398763961 is a deficient number, since it is larger than the sum of its proper divisors (2004039).

398763961 is a wasteful number, since it uses less digits than its factorization.

398763961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004038.

The product of its digits is 1469664, while the sum is 52.

The square root of 398763961 is about 19969.0751162892. The cubic root of 398763961 is about 736.0465822212.

The spelling of 398763961 in words is "three hundred ninety-eight million, seven hundred sixty-three thousand, nine hundred sixty-one".