1296155580 has 48 divisors (see below), whose sum is σ = 3754386720. Its totient is φ = 333722368.

The previous prime is 1296155569. The next prime is 1296155603. The reversal of 1296155580 is 855516921.

It is a happy number.

It is a super-3 number, since 3×1296155580³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370719 + ... + 374198.

It is an arithmetic number, because the mean of its divisors is an integer number (78216390).

Almost surely, 2^1296155580 is an apocalyptic number.

1296155580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1296155580 is an abundant number, since it is smaller than the sum of its proper divisors (2458231140).

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

1296155580 is a wasteful number, since it uses less digits than its factorization.

1296155580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744958 (or 744956 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 42.

The square root of 1296155580 is about 36002.1607684872. The cubic root of 1296155580 is about 1090.3159816730.

The spelling of 1296155580 in words is "one billion, two hundred ninety-six million, one hundred fifty-five thousand, five hundred eighty".