397950221751 has 8 divisors (see below), whose sum is σ = 534778251264. Its totient is φ = 263211170040.

The previous prime is 397950221743. The next prime is 397950221759. The reversal of 397950221751 is 157122059793.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (397950221743) and next prime (397950221759).

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

It is not a de Polignac number, because 397950221751 - 2³ = 397950221743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397950221694 and 397950221703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397950221759) 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, 522244005 + ... + 522244766.

It is an arithmetic number, because the mean of its divisors is an integer number (66847281408).

Almost surely, 2^397950221751 is an apocalyptic number.

397950221751 is a deficient number, since it is larger than the sum of its proper divisors (136828029513).

397950221751 is a wasteful number, since it uses less digits than its factorization.

397950221751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044488901.

The product of its (nonzero) digits is 1190700, while the sum is 51.

The spelling of 397950221751 in words is "three hundred ninety-seven billion, nine hundred fifty million, two hundred twenty-one thousand, seven hundred fifty-one".