400381398649 has 2 divisors, whose sum is σ = 400381398650. Its totient is φ = 400381398648.

The previous prime is 400381398617. The next prime is 400381398691. The reversal of 400381398649 is 946893183004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234553270249 + 165828128400 = 484307^2 + 407220^2 .

It is a cyclic number.

It is not a de Polignac number, because 400381398649 - 2⁵ = 400381398617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400381398649.

It is not a weakly prime, because it can be changed into another prime (400381395649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200190699324 + 200190699325.

It is an arithmetic number, because the mean of its divisors is an integer number (200190699325).

Almost surely, 2^400381398649 is an apocalyptic number.

It is an amenable number.

400381398649 is a deficient number, since it is larger than the sum of its proper divisors (1).

400381398649 is an equidigital number, since it uses as much as digits as its factorization.

400381398649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 400381398649 in words is "four hundred billion, three hundred eighty-one million, three hundred ninety-eight thousand, six hundred forty-nine".