1215776740 has 12 divisors (see below), whose sum is σ = 2553131196. Its totient is φ = 486310688.

The previous prime is 1215776729. The next prime is 1215776759. The reversal of 1215776740 is 476775121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 870486016 + 345290724 = 29504^2 + 18582^2 .

It is a super-2 number, since 2×1215776740² = 2956226163050055200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215776693 and 1215776702.

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, 30394399 + ... + 30394438.

It is an arithmetic number, because the mean of its divisors is an integer number (212760933).

Almost surely, 2^1215776740 is an apocalyptic number.

1215776740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215776740 is an abundant number, since it is smaller than the sum of its proper divisors (1337354456).

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

1215776740 is a wasteful number, since it uses less digits than its factorization.

1215776740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60788846 (or 60788844 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 1215776740 is about 34867.9901915783. The cubic root of 1215776740 is about 1067.2953323160.

The spelling of 1215776740 in words is "one billion, two hundred fifteen million, seven hundred seventy-six thousand, seven hundred forty".