397974541 has 2 divisors, whose sum is σ = 397974542. Its totient is φ = 397974540.

The previous prime is 397974491. The next prime is 397974547. The reversal of 397974541 is 145479793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370370025 + 27604516 = 19245^2 + 5254^2 .

It is a cyclic number.

It is not a de Polignac number, because 397974541 - 2¹⁹ = 397450253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397974547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198987270 + 198987271.

It is an arithmetic number, because the mean of its divisors is an integer number (198987271).

Almost surely, 2^397974541 is an apocalyptic number.

It is an amenable number.

397974541 is a deficient number, since it is larger than the sum of its proper divisors (1).

397974541 is an equidigital number, since it uses as much as digits as its factorization.

397974541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 397974541 is about 19949.2992608763. The cubic root of 397974541 is about 735.5605522214.

The spelling of 397974541 in words is "three hundred ninety-seven million, nine hundred seventy-four thousand, five hundred forty-one".