397521433 has 2 divisors, whose sum is σ = 397521434. Its totient is φ = 397521432.

The previous prime is 397521413. The next prime is 397521461. The reversal of 397521433 is 334125793.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316377369 + 81144064 = 17787^2 + 9008^2 .

It is an emirp because it is prime and its reverse (334125793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397521433 - 2¹³ = 397513241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397521392 and 397521401.

It is not a weakly prime, because it can be changed into another prime (397521413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198760716 + 198760717.

It is an arithmetic number, because the mean of its divisors is an integer number (198760717).

Almost surely, 2^397521433 is an apocalyptic number.

It is an amenable number.

397521433 is a deficient number, since it is larger than the sum of its proper divisors (1).

397521433 is an equidigital number, since it uses as much as digits as its factorization.

397521433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 37.

The square root of 397521433 is about 19937.9395374748. The cubic root of 397521433 is about 735.2812923666.

The spelling of 397521433 in words is "three hundred ninety-seven million, five hundred twenty-one thousand, four hundred thirty-three".