1240431637 has 2 divisors, whose sum is σ = 1240431638. Its totient is φ = 1240431636.

The previous prime is 1240431631. The next prime is 1240431641. The reversal of 1240431637 is 7361340421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629056561 + 611375076 = 25081^2 + 24726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240431637 - 2⁷ = 1240431509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240431599 and 1240431608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240431631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620215818 + 620215819.

It is an arithmetic number, because the mean of its divisors is an integer number (620215819).

Almost surely, 2^1240431637 is an apocalyptic number.

It is an amenable number.

1240431637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240431637 is an equidigital number, since it uses as much as digits as its factorization.

1240431637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 1240431637 is about 35219.7620236140. The cubic root of 1240431637 is about 1074.4617134175.

The spelling of 1240431637 in words is "one billion, two hundred forty million, four hundred thirty-one thousand, six hundred thirty-seven".