1240634879 has 4 divisors (see below), whose sum is σ = 1353419880. Its totient is φ = 1127849880.

The previous prime is 1240634851. The next prime is 1240634893. The reversal of 1240634879 is 9784360421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240634879 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 (1240634179) 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, 56392484 + ... + 56392505.

It is an arithmetic number, because the mean of its divisors is an integer number (338354970).

Almost surely, 2^1240634879 is an apocalyptic number.

1240634879 is a deficient number, since it is larger than the sum of its proper divisors (112785001).

1240634879 is a wasteful number, since it uses less digits than its factorization.

1240634879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112785000.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1240634879 is about 35222.6472457707. The cubic root of 1240634879 is about 1074.5203929436.

The spelling of 1240634879 in words is "one billion, two hundred forty million, six hundred thirty-four thousand, eight hundred seventy-nine".