1247082840 has 48 divisors (see below), whose sum is σ = 4053020400. Its totient is φ = 332555328.

The previous prime is 1247082833. The next prime is 1247082869. The reversal of 1247082840 is 482807421.

1247082840 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1247082795 and 1247082804.

It is a congruent number.

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, 1731700 + ... + 1732419.

It is an arithmetic number, because the mean of its divisors is an integer number (84437925).

Almost surely, 2^1247082840 is an apocalyptic number.

1247082840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247082840 is an abundant number, since it is smaller than the sum of its proper divisors (2805937560).

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

1247082840 is a wasteful number, since it uses less digits than its factorization.

1247082840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464136 (or 3464129 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 1247082840 is about 35314.0600894318. The cubic root of 1247082840 is about 1076.3787148723.

The spelling of 1247082840 in words is "one billion, two hundred forty-seven million, eighty-two thousand, eight hundred forty".