1240891493 has 2 divisors, whose sum is σ = 1240891494. Its totient is φ = 1240891492.

The previous prime is 1240891471. The next prime is 1240891499. The reversal of 1240891493 is 3941980421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1216753924 + 24137569 = 34882^2 + 4913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240891493 - 2⁶ = 1240891429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240891493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240891499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620445746 + 620445747.

It is an arithmetic number, because the mean of its divisors is an integer number (620445747).

Almost surely, 2^1240891493 is an apocalyptic number.

It is an amenable number.

1240891493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240891493 is an equidigital number, since it uses as much as digits as its factorization.

1240891493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1240891493 is about 35226.2897989556. The cubic root of 1240891493 is about 1074.5944727479.

The spelling of 1240891493 in words is "one billion, two hundred forty million, eight hundred ninety-one thousand, four hundred ninety-three".