1217698140 has 24 divisors (see below), whose sum is σ = 3409554960. Its totient is φ = 324719488.

The previous prime is 1217698129. The next prime is 1217698159. The reversal of 1217698140 is 418967121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10147425 + ... + 10147544.

It is an arithmetic number, because the mean of its divisors is an integer number (142064790).

Almost surely, 2^1217698140 is an apocalyptic number.

1217698140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217698140 is an abundant number, since it is smaller than the sum of its proper divisors (2191856820).

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

1217698140 is a wasteful number, since it uses less digits than its factorization.

1217698140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20294981 (or 20294979 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1217698140 is about 34895.5318056625. The cubic root of 1217698140 is about 1067.8572835991.

The spelling of 1217698140 in words is "one billion, two hundred seventeen million, six hundred ninety-eight thousand, one hundred forty".