397601961 has 16 divisors (see below), whose sum is σ = 559563840. Its totient is φ = 250430400.

The previous prime is 397601959. The next prime is 397601983. The reversal of 397601961 is 169106793.

It is not a de Polignac number, because 397601961 - 2¹ = 397601959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397601761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11911 + ... + 30611.

It is an arithmetic number, because the mean of its divisors is an integer number (34972740).

Almost surely, 2^397601961 is an apocalyptic number.

It is an amenable number.

397601961 is a deficient number, since it is larger than the sum of its proper divisors (161961879).

397601961 is a wasteful number, since it uses less digits than its factorization.

397601961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19096.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 397601961 is about 19939.9589016628. The cubic root of 397601961 is about 735.3309389426.

The spelling of 397601961 in words is "three hundred ninety-seven million, six hundred one thousand, nine hundred sixty-one".