396645749 has 2 divisors, whose sum is σ = 396645750. Its totient is φ = 396645748.

The previous prime is 396645671. The next prime is 396645761. The reversal of 396645749 is 947546693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371795524 + 24850225 = 19282^2 + 4985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396645749 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396645749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396645149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198322874 + 198322875.

It is an arithmetic number, because the mean of its divisors is an integer number (198322875).

Almost surely, 2^396645749 is an apocalyptic number.

It is an amenable number.

396645749 is a deficient number, since it is larger than the sum of its proper divisors (1).

396645749 is an equidigital number, since it uses as much as digits as its factorization.

396645749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The square root of 396645749 is about 19915.9671871592. The cubic root of 396645749 is about 734.7409882242.

The spelling of 396645749 in words is "three hundred ninety-six million, six hundred forty-five thousand, seven hundred forty-nine".