397623341981 has 8 divisors (see below), whose sum is σ = 401176640760. Its totient is φ = 394070648832.

The previous prime is 397623341977. The next prime is 397623342041. The reversal of 397623341981 is 189143326793.

It can be written as a sum of positive squares in 4 ways, for example, as 150474168100 + 247149173881 = 387910^2 + 497141^2 .

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 397623341981 - 2² = 397623341977 is a prime.

It is a super-2 number, since 2×397623341981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397623341581) 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, 1223021 + ... + 1513613.

It is an arithmetic number, because the mean of its divisors is an integer number (50147080095).

Almost surely, 2^397623341981 is an apocalyptic number.

It is an amenable number.

397623341981 is a deficient number, since it is larger than the sum of its proper divisors (3553298779).

397623341981 is a wasteful number, since it uses less digits than its factorization.

397623341981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302815.

The product of its digits is 5878656, while the sum is 56.

The spelling of 397623341981 in words is "three hundred ninety-seven billion, six hundred twenty-three million, three hundred forty-one thousand, nine hundred eighty-one".