1247409408 has 144 divisors (see below), whose sum is σ = 4017686400. Its totient is φ = 335413248.

The previous prime is 1247409311. The next prime is 1247409433. The reversal of 1247409408 is 8049047421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84568 + ... + 98216.

It is an arithmetic number, because the mean of its divisors is an integer number (27900600).

Almost surely, 2^1247409408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247409408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008843200).

1247409408 is an abundant number, since it is smaller than the sum of its proper divisors (2770276992).

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

1247409408 is a wasteful number, since it uses less digits than its factorization.

1247409408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13692 (or 13678 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1247409408 is about 35318.6835541757. The cubic root of 1247409408 is about 1076.4726621639.

The spelling of 1247409408 in words is "one billion, two hundred forty-seven million, four hundred nine thousand, four hundred eight".