397360981 has 4 divisors (see below), whose sum is σ = 404858412. Its totient is φ = 389863552.

The previous prime is 397360963. The next prime is 397361021. The reversal of 397360981 is 189063793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326380356 + 70980625 = 18066^2 + 8425^2 .

It is a cyclic number.

It is not a de Polignac number, because 397360981 - 2²³ = 388972373 is a prime.

It is a super-2 number, since 2×397360981² = 315791498442564722, which 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 (397360081) 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, 3748636 + ... + 3748741.

It is an arithmetic number, because the mean of its divisors is an integer number (101214603).

Almost surely, 2^397360981 is an apocalyptic number.

It is an amenable number.

397360981 is a deficient number, since it is larger than the sum of its proper divisors (7497431).

397360981 is an equidigital number, since it uses as much as digits as its factorization.

397360981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7497430.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 397360981 is about 19933.9153454609. The cubic root of 397360981 is about 735.1823515961.

The spelling of 397360981 in words is "three hundred ninety-seven million, three hundred sixty thousand, nine hundred eighty-one".