1240429961 has 4 divisors (see below), whose sum is σ = 1249899024. Its totient is φ = 1230960900.

The previous prime is 1240429913. The next prime is 1240429999. The reversal of 1240429961 is 1699240421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1699240421 = 89 ⋅19092589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240429961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240429061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4734335 + ... + 4734596.

It is an arithmetic number, because the mean of its divisors is an integer number (312474756).

Almost surely, 2^1240429961 is an apocalyptic number.

It is an amenable number.

1240429961 is a deficient number, since it is larger than the sum of its proper divisors (9469063).

1240429961 is an equidigital number, since it uses as much as digits as its factorization.

1240429961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469062.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1240429961 is about 35219.7382301459. The cubic root of 1240429961 is about 1074.4612295003.

The spelling of 1240429961 in words is "one billion, two hundred forty million, four hundred twenty-nine thousand, nine hundred sixty-one".