1243980 has 36 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 331680.

The previous prime is 1243969. The next prime is 1243997. The reversal of 1243980 is 893421.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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, 3276 + ... + 3635.

It is an arithmetic number, because the mean of its divisors is an integer number (104832).

2^1243980 is an apocalyptic number.

1243980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243980 is an abundant number, since it is smaller than the sum of its proper divisors (2529972).

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

1243980 is a wasteful number, since it uses less digits than its factorization.

1243980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6926 (or 6921 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1243980 is about 1115.3385136361. The cubic root of 1243980 is about 107.5485268562.

The spelling of 1243980 in words is "one million, two hundred forty-three thousand, nine hundred eighty".