1247787840 has 168 divisors, whose sum is σ = 4290474528. Its totient is φ = 307107840.

The previous prime is 1247787839. The next prime is 1247787899. The reversal of 1247787840 is 487877421.

1247787840 is digitally balanced in base 4, 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 (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1247787840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158395 + ... + 166085.

Almost surely, 2^1247787840 is an apocalyptic number.

1247787840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247787840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145237264).

1247787840 is an abundant number, since it is smaller than the sum of its proper divisors (3042686688).

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

1247787840 is a wasteful number, since it uses less digits than its factorization.

1247787840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7737 (or 7714 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 48.

The square root of 1247787840 is about 35324.0405389870. The cubic root of 1247787840 is about 1076.5815092170.

The spelling of 1247787840 in words is "one billion, two hundred forty-seven million, seven hundred eighty-seven thousand, eight hundred forty".