400249999997 has 2 divisors, whose sum is σ = 400249999998. Its totient is φ = 400249999996.

The previous prime is 400249999957. The next prime is 400250000023. The reversal of 400249999997 is 799999942004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354619059001 + 45630940996 = 595499^2 + 213614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400249999997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400249999997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400249999937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200124999998 + 200124999999.

It is an arithmetic number, because the mean of its divisors is an integer number (200124999999).

Almost surely, 2^400249999997 is an apocalyptic number.

It is an amenable number.

400249999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

400249999997 is an equidigital number, since it uses as much as digits as its factorization.

400249999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119042784, while the sum is 71.

The spelling of 400249999997 in words is "four hundred billion, two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".