397806291 has 48 divisors (see below), whose sum is σ = 609157120. Its totient is φ = 249842880.

The previous prime is 397806271. The next prime is 397806319. The reversal of 397806291 is 192608793.

It is not a de Polignac number, because 397806291 - 2¹³ = 397798099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397806221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3132270 + ... + 3132396.

Almost surely, 2^397806291 is an apocalyptic number.

397806291 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

397806291 is a deficient number, since it is larger than the sum of its proper divisors (211350829).

397806291 is a wasteful number, since it uses less digits than its factorization.

397806291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 397806291 is about 19945.0818749886. The cubic root of 397806291 is about 735.4568810109.

The spelling of 397806291 in words is "three hundred ninety-seven million, eight hundred six thousand, two hundred ninety-one".