397801949 has 2 divisors, whose sum is σ = 397801950. Its totient is φ = 397801948.

The previous prime is 397801939. The next prime is 397802011. The reversal of 397801949 is 949108793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251222500 + 146579449 = 15850^2 + 12107^2 .

It is a cyclic number.

It is not a de Polignac number, because 397801949 - 2⁸ = 397801693 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 397801897 and 397801906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397801919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198900974 + 198900975.

It is an arithmetic number, because the mean of its divisors is an integer number (198900975).

Almost surely, 2^397801949 is an apocalyptic number.

It is an amenable number.

397801949 is a deficient number, since it is larger than the sum of its proper divisors (1).

397801949 is an equidigital number, since it uses as much as digits as its factorization.

397801949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 397801949 is about 19944.9730258028. The cubic root of 397801949 is about 735.4542051982.

The spelling of 397801949 in words is "three hundred ninety-seven million, eight hundred one thousand, nine hundred forty-nine".