1217142956 has 12 divisors (see below), whose sum is σ = 2198710080. Its totient is φ = 588940080.

The previous prime is 1217142947. The next prime is 1217142991. The reversal of 1217142956 is 6592417121.

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, 4907711 + ... + 4907958.

It is an arithmetic number, because the mean of its divisors is an integer number (183225840).

Almost surely, 2^1217142956 is an apocalyptic number.

It is an amenable number.

1217142956 is a deficient number, since it is larger than the sum of its proper divisors (981567124).

1217142956 is a wasteful number, since it uses less digits than its factorization.

1217142956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9815704 (or 9815702 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 1217142956 is about 34887.5759547722. The cubic root of 1217142956 is about 1067.6949698637.

The spelling of 1217142956 in words is "one billion, two hundred seventeen million, one hundred forty-two thousand, nine hundred fifty-six".