1379251980 has 72 divisors (see below), whose sum is σ = 4187356992. Its totient is φ = 367481856.

The previous prime is 1379251921. The next prime is 1379251987. The reversal of 1379251980 is 891529731.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1379251987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265084 + ... + 270236.

It is an arithmetic number, because the mean of its divisors is an integer number (58157736).

Almost surely, 2^1379251980 is an apocalyptic number.

1379251980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1379251980 is an abundant number, since it is smaller than the sum of its proper divisors (2808105012).

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

1379251980 is a wasteful number, since it uses less digits than its factorization.

1379251980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6655 (or 6650 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1379251980 is about 37138.2818665592. The cubic root of 1379251980 is about 1113.1350862742.

The spelling of 1379251980 in words is "one billion, three hundred seventy-nine million, two hundred fifty-one thousand, nine hundred eighty".