1379980 has 24 divisors (see below), whose sum is σ = 3312288. Its totient is φ = 473088.

The previous prime is 1379969. The next prime is 1379981. The reversal of 1379980 is 899731.

1379980 = 441² + 442² + ... + 447².

It is not an unprimeable number, because it can be changed into a prime (1379981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4789 + ... + 5068.

It is an arithmetic number, because the mean of its divisors is an integer number (138012).

2^1379980 is an apocalyptic number.

1379980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1379980 is an abundant number, since it is smaller than the sum of its proper divisors (1932308).

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

1379980 is a wasteful number, since it uses less digits than its factorization.

1379980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9873 (or 9871 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1379980 is about 1174.7254998509. The cubic root of 1379980 is about 111.3330903059. Note that the first 3 decimals are identical.

Subtracting from 1379980 its reverse (899731), we obtain a square (480249 = 693²).

The spelling of 1379980 in words is "one million, three hundred seventy-nine thousand, nine hundred eighty".