1247980 has 24 divisors (see below), whose sum is σ = 2735712. Its totient is φ = 477312.

The previous prime is 1247969. The next prime is 1248001. The reversal of 1247980 is 897421.

1247980 = T₈₀ + T₈₁ + ... + T₁₉₉.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897 + ... + 1816.

It is an arithmetic number, because the mean of its divisors is an integer number (113988).

2^1247980 is an apocalyptic number.

1247980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247980 is an abundant number, since it is smaller than the sum of its proper divisors (1487732).

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

1247980 is a wasteful number, since it uses less digits than its factorization.

1247980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1247980 is about 1117.1302520297. The cubic root of 1247980 is about 107.6636771091.

The spelling of 1247980 in words is "one million, two hundred forty-seven thousand, nine hundred eighty".