1247959440 has 480 divisors, whose sum is σ = 5390904960. Its totient is φ = 263015424.

The previous prime is 1247959439. The next prime is 1247959519. The reversal of 1247959440 is 449597421.

1247959440 is a `hidden beast` number, since 12 + 4 + 7 + 9 + 594 + 40 = 666.

It is a super-2 number, since 2×1247959440² = 3114805527770227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1375467 + ... + 1376373.

It is an arithmetic number, because the mean of its divisors is an integer number (11231052).

Almost surely, 2^1247959440 is an apocalyptic number.

1247959440 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 1247959440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2695452480).

1247959440 is an abundant number, since it is smaller than the sum of its proper divisors (4142945520).

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

1247959440 is a wasteful number, since it uses less digits than its factorization.

1247959440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1247959440 is about 35326.4693961907. The cubic root of 1247959440 is about 1076.6308586638.

The spelling of 1247959440 in words is "one billion, two hundred forty-seven million, nine hundred fifty-nine thousand, four hundred forty".