397800643 has 2 divisors, whose sum is σ = 397800644. Its totient is φ = 397800642.

The previous prime is 397800631. The next prime is 397800659. The reversal of 397800643 is 346008793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397800643 - 2²¹ = 395703491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397800596 and 397800605.

It is not a weakly prime, because it can be changed into another prime (397800673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198900321 + 198900322.

It is an arithmetic number, because the mean of its divisors is an integer number (198900322).

Almost surely, 2^397800643 is an apocalyptic number.

397800643 is a deficient number, since it is larger than the sum of its proper divisors (1).

397800643 is an equidigital number, since it uses as much as digits as its factorization.

397800643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 397800643 is about 19944.9402856965. The cubic root of 397800643 is about 735.4534003553.

The spelling of 397800643 in words is "three hundred ninety-seven million, eight hundred thousand, six hundred forty-three".