400145640989 has 2 divisors, whose sum is σ = 400145640990. Its totient is φ = 400145640988.

The previous prime is 400145640911. The next prime is 400145640997. The reversal of 400145640989 is 989046541004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312108816889 + 88036824100 = 558667^2 + 296710^2 .

It is a cyclic number.

It is not a de Polignac number, because 400145640989 - 2⁸ = 400145640733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400145648989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200072820494 + 200072820495.

It is an arithmetic number, because the mean of its divisors is an integer number (200072820495).

Almost surely, 2^400145640989 is an apocalyptic number.

It is an amenable number.

400145640989 is a deficient number, since it is larger than the sum of its proper divisors (1).

400145640989 is an equidigital number, since it uses as much as digits as its factorization.

400145640989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 400145640989 in words is "four hundred billion, one hundred forty-five million, six hundred forty thousand, nine hundred eighty-nine".