1297671780 has 48 divisors (see below), whose sum is σ = 3750695424. Its totient is φ = 334882560.

The previous prime is 1297671751. The next prime is 1297671797. The reversal of 1297671780 is 871767921.

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, 346977 + ... + 350696.

It is an arithmetic number, because the mean of its divisors is an integer number (78139488).

Almost surely, 2^1297671780 is an apocalyptic number.

1297671780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297671780 is an abundant number, since it is smaller than the sum of its proper divisors (2453023644).

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

1297671780 is a wasteful number, since it uses less digits than its factorization.

1297671780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697716 (or 697714 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 48.

The square root of 1297671780 is about 36023.2116835798. The cubic root of 1297671780 is about 1090.7409545545.

The spelling of 1297671780 in words is "one billion, two hundred ninety-seven million, six hundred seventy-one thousand, seven hundred eighty".