1213579880 has 16 divisors (see below), whose sum is σ = 2730554820. Its totient is φ = 485431936.

The previous prime is 1213579877. The next prime is 1213579883. The reversal of 1213579880 is 889753121.

It is an interprime number because it is at equal distance from previous prime (1213579877) and next prime (1213579883).

It can be written as a sum of positive squares in 2 ways, for example, as 1159674916 + 53904964 = 34054^2 + 7342^2 .

It is a super-2 number, since 2×1213579880² = 2945552250281628800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213579883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15169709 + ... + 15169788.

Almost surely, 2^1213579880 is an apocalyptic number.

1213579880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213579880 is an abundant number, since it is smaller than the sum of its proper divisors (1516974940).

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

1213579880 is a wasteful number, since it uses less digits than its factorization.

1213579880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30339508 (or 30339504 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1213579880 is about 34836.4734150861. The cubic root of 1213579880 is about 1066.6520913807.

The spelling of 1213579880 in words is "one billion, two hundred thirteen million, five hundred seventy-nine thousand, eight hundred eighty".