1240820836 has 12 divisors (see below), whose sum is σ = 2265846912. Its totient is φ = 593436008.

The previous prime is 1240820807. The next prime is 1240820869. The reversal of 1240820836 is 6380280421.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6743500 + ... + 6743683.

It is an arithmetic number, because the mean of its divisors is an integer number (188820576).

Almost surely, 2^1240820836 is an apocalyptic number.

It is an amenable number.

1240820836 is a deficient number, since it is larger than the sum of its proper divisors (1025026076).

1240820836 is a wasteful number, since it uses less digits than its factorization.

1240820836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13487210 (or 13487208 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 1240820836 is about 35225.2868831469. The cubic root of 1240820836 is about 1074.5740763734.

The spelling of 1240820836 in words is "one billion, two hundred forty million, eight hundred twenty thousand, eight hundred thirty-six".