397187633 has 2 divisors, whose sum is σ = 397187634. Its totient is φ = 397187632.

The previous prime is 397187617. The next prime is 397187639. The reversal of 397187633 is 336781793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206554384 + 190633249 = 14372^2 + 13807^2 .

It is a cyclic number.

It is not a de Polignac number, because 397187633 - 2⁴ = 397187617 is a prime.

It is not a weakly prime, because it can be changed into another prime (397187639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198593816 + 198593817.

It is an arithmetic number, because the mean of its divisors is an integer number (198593817).

Almost surely, 2^397187633 is an apocalyptic number.

It is an amenable number.

397187633 is a deficient number, since it is larger than the sum of its proper divisors (1).

397187633 is an equidigital number, since it uses as much as digits as its factorization.

397187633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 47.

The square root of 397187633 is about 19929.5668041230. The cubic root of 397187633 is about 735.0754287283.

The spelling of 397187633 in words is "three hundred ninety-seven million, one hundred eighty-seven thousand, six hundred thirty-three".