400260997 has 2 divisors, whose sum is σ = 400260998. Its totient is φ = 400260996.

The previous prime is 400260967. The next prime is 400261003. The reversal of 400260997 is 799062004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388523521 + 11737476 = 19711^2 + 3426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400260997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400260967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200130498 + 200130499.

It is an arithmetic number, because the mean of its divisors is an integer number (200130499).

Almost surely, 2^400260997 is an apocalyptic number.

It is an amenable number.

400260997 is a deficient number, since it is larger than the sum of its proper divisors (1).

400260997 is an equidigital number, since it uses as much as digits as its factorization.

400260997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 400260997 is about 20006.5238609809. The cubic root of 400260997 is about 736.9665184141.

The spelling of 400260997 in words is "four hundred million, two hundred sixty thousand, nine hundred ninety-seven".