1217015440 has 40 divisors (see below), whose sum is σ = 2832553080. Its totient is φ = 486291456.

The previous prime is 1217015333. The next prime is 1217015441. The reversal of 1217015440 is 445107121.

It can be written as a sum of positive squares in 4 ways, for example, as 8479744 + 1208535696 = 2912^2 + 34764^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1217015440² = 2962253162396787200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1217015441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73182 + ... + 88258.

It is an arithmetic number, because the mean of its divisors is an integer number (70813827).

Almost surely, 2^1217015440 is an apocalyptic number.

1217015440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217015440 is an abundant number, since it is smaller than the sum of its proper divisors (1615537640).

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

1217015440 is a wasteful number, since it uses less digits than its factorization.

1217015440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16099 (or 16093 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1217015440 is about 34885.7483795317. The cubic root of 1217015440 is about 1067.6576822835.

The spelling of 1217015440 in words is "one billion, two hundred seventeen million, fifteen thousand, four hundred forty".