398951356621 has 8 divisors (see below), whose sum is σ = 404435359800. Its totient is φ = 393467864832.

The previous prime is 398951356607. The next prime is 398951356669. The reversal of 398951356621 is 126653159893.

It can be written as a sum of positive squares in 4 ways, for example, as 4001954121 + 394949402500 = 63261^2 + 628450^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398951356621 - 2⁷ = 398951356493 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 (398951356681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1603041 + ... + 1835113.

It is an arithmetic number, because the mean of its divisors is an integer number (50554419975).

Almost surely, 2^398951356621 is an apocalyptic number.

It is an amenable number.

398951356621 is a deficient number, since it is larger than the sum of its proper divisors (5484003179).

398951356621 is a wasteful number, since it uses less digits than its factorization.

398951356621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255695.

The product of its digits is 10497600, while the sum is 58.

The spelling of 398951356621 in words is "three hundred ninety-eight billion, nine hundred fifty-one million, three hundred fifty-six thousand, six hundred twenty-one".