1345817980 has 36 divisors (see below), whose sum is σ = 3060349992. Its totient is φ = 496916160.

The previous prime is 1345817969. The next prime is 1345818037. The reversal of 1345817980 is 897185431.

It is a happy number.

It is a super-2 number, since 2×1345817980² = 3622452070582560800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1345817980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195706 + ... + 202465.

It is an arithmetic number, because the mean of its divisors is an integer number (85009722).

Almost surely, 2^1345817980 is an apocalyptic number.

1345817980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1345817980 is an abundant number, since it is smaller than the sum of its proper divisors (1714532012).

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

1345817980 is a wasteful number, since it uses less digits than its factorization.

1345817980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398206 (or 398191 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 1345817980 is about 36685.3919155841. The cubic root of 1345817980 is about 1104.0670325731.

The spelling of 1345817980 in words is "one billion, three hundred forty-five million, eight hundred seventeen thousand, nine hundred eighty".