1240742731 has 4 divisors (see below), whose sum is σ = 1306045000. Its totient is φ = 1175440464.

The previous prime is 1240742677. The next prime is 1240742743. The reversal of 1240742731 is 1372470421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1240742731 - 2⁹ = 1240742219 is a prime.

It is a super-2 number, since 2×1240742731² = 3078885049058676722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240742693 and 1240742702.

It is not an unprimeable number, because it can be changed into a prime (1240742431) 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 3 ways as a sum of consecutive naturals, for example, 32651106 + ... + 32651143.

It is an arithmetic number, because the mean of its divisors is an integer number (326511250).

Almost surely, 2^1240742731 is an apocalyptic number.

1240742731 is a deficient number, since it is larger than the sum of its proper divisors (65302269).

1240742731 is an equidigital number, since it uses as much as digits as its factorization.

1240742731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65302268.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 1240742731 is about 35224.1782161061. The cubic root of 1240742731 is about 1074.5515291028.

The spelling of 1240742731 in words is "one billion, two hundred forty million, seven hundred forty-two thousand, seven hundred thirty-one".