40240243969 has 2 divisors, whose sum is σ = 40240243970. Its totient is φ = 40240243968.

The previous prime is 40240243937. The next prime is 40240244053. The reversal of 40240243969 is 96934204204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36854400625 + 3385843344 = 191975^2 + 58188^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240243969 - 2⁵ = 40240243937 is a prime.

It is a super-2 number, since 2×40240243969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40240243369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120121984 + 20120121985.

It is an arithmetic number, because the mean of its divisors is an integer number (20120121985).

Almost surely, 2^40240243969 is an apocalyptic number.

It is an amenable number.

40240243969 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240243969 is an equidigital number, since it uses as much as digits as its factorization.

40240243969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 40240243969 in words is "forty billion, two hundred forty million, two hundred forty-three thousand, nine hundred sixty-nine".