400940457989 has 2 divisors, whose sum is σ = 400940457990. Its totient is φ = 400940457988.

The previous prime is 400940457979. The next prime is 400940458031. The reversal of 400940457989 is 989754049004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391354089889 + 9586368100 = 625583^2 + 97910^2 .

It is a cyclic number.

It is not a de Polignac number, because 400940457989 - 2⁸ = 400940457733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400940457949) 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, 200470228994 + 200470228995.

It is an arithmetic number, because the mean of its divisors is an integer number (200470228995).

Almost surely, 2^400940457989 is an apocalyptic number.

It is an amenable number.

400940457989 is a deficient number, since it is larger than the sum of its proper divisors (1).

400940457989 is an equidigital number, since it uses as much as digits as its factorization.

400940457989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 400940457989 in words is "four hundred billion, nine hundred forty million, four hundred fifty-seven thousand, nine hundred eighty-nine".