397213903 has 2 divisors, whose sum is σ = 397213904. Its totient is φ = 397213902.

The previous prime is 397213837. The next prime is 397213909. The reversal of 397213903 is 309312793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397213903 - 2⁹ = 397213391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397213909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198606951 + 198606952.

It is an arithmetic number, because the mean of its divisors is an integer number (198606952).

Almost surely, 2^397213903 is an apocalyptic number.

397213903 is a deficient number, since it is larger than the sum of its proper divisors (1).

397213903 is an equidigital number, since it uses as much as digits as its factorization.

397213903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 397213903 is about 19930.2258642495. The cubic root of 397213903 is about 735.0916343401.

The spelling of 397213903 in words is "three hundred ninety-seven million, two hundred thirteen thousand, nine hundred three".