1240430661 has 12 divisors (see below), whose sum is σ = 1840158892. Its totient is φ = 804603456.

The previous prime is 1240430657. The next prime is 1240430671. The reversal of 1240430661 is 1660340421.

It can be written as a sum of positive squares in 2 ways, for example, as 1066349025 + 174081636 = 32655^2 + 13194^2 .

It is not a de Polignac number, because 1240430661 - 2² = 1240430657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240430651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1862176 + ... + 1862841.

Almost surely, 2^1240430661 is an apocalyptic number.

It is an amenable number.

1240430661 is a deficient number, since it is larger than the sum of its proper divisors (599728231).

1240430661 is a wasteful number, since it uses less digits than its factorization.

1240430661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725060 (or 3725057 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1240430661 is about 35219.7481677538. The cubic root of 1240430661 is about 1074.4614316137.

The spelling of 1240430661 in words is "one billion, two hundred forty million, four hundred thirty thousand, six hundred sixty-one".