1240149187 has 2 divisors, whose sum is σ = 1240149188. Its totient is φ = 1240149186.

The previous prime is 1240149139. The next prime is 1240149223. The reversal of 1240149187 is 7819410421.

It is a strong prime.

It is an emirp because it is prime and its reverse (7819410421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240149187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240149137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620074593 + 620074594.

It is an arithmetic number, because the mean of its divisors is an integer number (620074594).

Almost surely, 2^1240149187 is an apocalyptic number.

1240149187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240149187 is an equidigital number, since it uses as much as digits as its factorization.

1240149187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1240149187 is about 35215.7519726613. The cubic root of 1240149187 is about 1074.3801545097.

The spelling of 1240149187 in words is "one billion, two hundred forty million, one hundred forty-nine thousand, one hundred eighty-seven".