1218792492 has 36 divisors (see below), whose sum is σ = 3262063896. Its totient is φ = 382366080.

The previous prime is 1218792437. The next prime is 1218792529. The reversal of 1218792492 is 2942978121.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 995134 + ... + 996357.

It is an arithmetic number, because the mean of its divisors is an integer number (90612886).

Almost surely, 2^1218792492 is an apocalyptic number.

1218792492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218792492 is an abundant number, since it is smaller than the sum of its proper divisors (2043271404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218792492 is a wasteful number, since it uses less digits than its factorization.

1218792492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991518 (or 1991513 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1218792492 is about 34911.2086871824. The cubic root of 1218792492 is about 1068.1770842161.

The spelling of 1218792492 in words is "one billion, two hundred eighteen million, seven hundred ninety-two thousand, four hundred ninety-two".