397929229 has 2 divisors, whose sum is σ = 397929230. Its totient is φ = 397929228.

The previous prime is 397929197. The next prime is 397929269. The reversal of 397929229 is 922929793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377408329 + 20520900 = 19427^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 397929229 - 2⁵ = 397929197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397929269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198964614 + 198964615.

It is an arithmetic number, because the mean of its divisors is an integer number (198964615).

Almost surely, 2^397929229 is an apocalyptic number.

It is an amenable number.

397929229 is a deficient number, since it is larger than the sum of its proper divisors (1).

397929229 is an equidigital number, since it uses as much as digits as its factorization.

397929229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 52.

The square root of 397929229 is about 19948.1635495601. The cubic root of 397929229 is about 735.5326350380.

The spelling of 397929229 in words is "three hundred ninety-seven million, nine hundred twenty-nine thousand, two hundred twenty-nine".