397201811 has 4 divisors (see below), whose sum is σ = 399198000. Its totient is φ = 395205624.

The previous prime is 397201807. The next prime is 397201817. The reversal of 397201811 is 118102793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118102793 = 6907 ⋅17099.

It is a cyclic number.

It is not a de Polignac number, because 397201811 - 2² = 397201807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397201817) 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, 997796 + ... + 998193.

It is an arithmetic number, because the mean of its divisors is an integer number (99799500).

Almost surely, 2^397201811 is an apocalyptic number.

397201811 is a deficient number, since it is larger than the sum of its proper divisors (1996189).

397201811 is a wasteful number, since it uses less digits than its factorization.

397201811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996188.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 397201811 is about 19929.9225036125. The cubic root of 397201811 is about 735.0841750357.

The spelling of 397201811 in words is "three hundred ninety-seven million, two hundred one thousand, eight hundred eleven".