397209949 has 2 divisors, whose sum is σ = 397209950. Its totient is φ = 397209948.

The previous prime is 397209941. The next prime is 397209959. The reversal of 397209949 is 949902793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274399225 + 122810724 = 16565^2 + 11082^2 .

It is a cyclic number.

It is not a de Polignac number, because 397209949 - 2³ = 397209941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397209896 and 397209905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397209941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198604974 + 198604975.

It is an arithmetic number, because the mean of its divisors is an integer number (198604975).

Almost surely, 2^397209949 is an apocalyptic number.

It is an amenable number.

397209949 is a deficient number, since it is larger than the sum of its proper divisors (1).

397209949 is an equidigital number, since it uses as much as digits as its factorization.

397209949 is an evil number, because the sum of its binary digits is even.

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

The square root of 397209949 is about 19930.1266679367. The cubic root of 397209949 is about 735.0891952161.

The spelling of 397209949 in words is "three hundred ninety-seven million, two hundred nine thousand, nine hundred forty-nine".