397200661 has 32 divisors (see below), whose sum is σ = 491210496. Its totient is φ = 316224000.

The previous prime is 397200647. The next prime is 397200667. The reversal of 397200661 is 166002793.

It is a cyclic number.

It is not a de Polignac number, because 397200661 - 2¹³ = 397192469 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397200667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216016 + ... + 217846.

It is an arithmetic number, because the mean of its divisors is an integer number (15350328).

Almost surely, 2^397200661 is an apocalyptic number.

It is an amenable number.

397200661 is a deficient number, since it is larger than the sum of its proper divisors (94009835).

397200661 is a wasteful number, since it uses less digits than its factorization.

397200661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 397200661 is about 19929.8936525010. The cubic root of 397200661 is about 735.0834656167.

The spelling of 397200661 in words is "three hundred ninety-seven million, two hundred thousand, six hundred sixty-one".