1247387904 has 432 divisors, whose sum is σ = 4473907200. Its totient is φ = 341397504.

The previous prime is 1247387899. The next prime is 1247387941. The reversal of 1247387904 is 4097837421.

1247387904 is a `hidden beast` number, since 12 + 473 + 87 + 90 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a self number, because there is not a number n which added to its sum of digits gives 1247387904.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9821889 + ... + 9822015.

Almost surely, 2^1247387904 is an apocalyptic number.

1247387904 is a gapful number since it is divisible by the number (14) 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 1247387904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236953600).

1247387904 is an abundant number, since it is smaller than the sum of its proper divisors (3226519296).

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

1247387904 is a wasteful number, since it uses less digits than its factorization.

1247387904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 1247387904 is about 35318.3791247560. The cubic root of 1247387904 is about 1076.4664763837.

The spelling of 1247387904 in words is "one billion, two hundred forty-seven million, three hundred eighty-seven thousand, nine hundred four".