1247880 has 32 divisors (see below), whose sum is σ = 3744000. Its totient is φ = 332736.

The previous prime is 1247879. The next prime is 1247881. The reversal of 1247880 is 887421.

It is an interprime number because it is at equal distance from previous prime (1247879) and next prime (1247881).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1247881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5080 + ... + 5319.

It is an arithmetic number, because the mean of its divisors is an integer number (117000).

2^1247880 is an apocalyptic number.

1247880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247880 is an abundant number, since it is smaller than the sum of its proper divisors (2496120).

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

1247880 is a wasteful number, since it uses less digits than its factorization.

1247880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413 (or 10409 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 1247880 is about 1117.0854935948. The cubic root of 1247880 is about 107.6608013538.

The spelling of 1247880 in words is "one million, two hundred forty-seven thousand, eight hundred eighty".