1217657970 has 24 divisors (see below), whose sum is σ = 3165910956. Its totient is φ = 324708768.

The previous prime is 1217657941. The next prime is 1217657971. The reversal of 1217657970 is 797567121.

1217657970 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 6 + 579 + 70 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1104299361 + 113358609 = 33231^2 + 10647^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1217657971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6764677 + ... + 6764856.

Almost surely, 2^1217657970 is an apocalyptic number.

1217657970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1217657970 is an abundant number, since it is smaller than the sum of its proper divisors (1948252986).

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

1217657970 is a wasteful number, since it uses less digits than its factorization.

1217657970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13529546 (or 13529543 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

The square root of 1217657970 is about 34894.9562257929. The cubic root of 1217657970 is about 1067.8455411436.

The spelling of 1217657970 in words is "one billion, two hundred seventeen million, six hundred fifty-seven thousand, nine hundred seventy".