397563661 has 8 divisors (see below), whose sum is σ = 434036448. Its totient is φ = 361146000.

The previous prime is 397563637. The next prime is 397563667. The reversal of 397563661 is 166365793.

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 397563661 - 2⁹ = 397563149 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 (397563667) 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, 2106 + ... + 28276.

It is an arithmetic number, because the mean of its divisors is an integer number (54254556).

Almost surely, 2^397563661 is an apocalyptic number.

It is an amenable number.

397563661 is a deficient number, since it is larger than the sum of its proper divisors (36472787).

397563661 is a wasteful number, since it uses less digits than its factorization.

397563661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27563.

The product of its digits is 612360, while the sum is 46.

The square root of 397563661 is about 19938.9984954109. The cubic root of 397563661 is about 735.3073273226.

The spelling of 397563661 in words is "three hundred ninety-seven million, five hundred sixty-three thousand, six hundred sixty-one".