397545077 has 2 divisors, whose sum is σ = 397545078. Its totient is φ = 397545076.

The previous prime is 397545073. The next prime is 397545097. The reversal of 397545077 is 770545793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393387556 + 4157521 = 19834^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 397545077 - 2² = 397545073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397545073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198772538 + 198772539.

It is an arithmetic number, because the mean of its divisors is an integer number (198772539).

Almost surely, 2^397545077 is an apocalyptic number.

It is an amenable number.

397545077 is a deficient number, since it is larger than the sum of its proper divisors (1).

397545077 is an equidigital number, since it uses as much as digits as its factorization.

397545077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 926100, while the sum is 47.

The square root of 397545077 is about 19938.5324685645. The cubic root of 397545077 is about 735.2958699003.

The spelling of 397545077 in words is "three hundred ninety-seven million, five hundred forty-five thousand, seventy-seven".