1247992900 has 144 divisors (see below), whose sum is σ = 3433030272. Its totient is φ = 382464000.

The previous prime is 1247992883. The next prime is 1247992919. The reversal of 1247992900 is 92997421.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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 47 ways as a sum of consecutive naturals, for example, 468372 + ... + 471028.

It is an arithmetic number, because the mean of its divisors is an integer number (23840488).

Almost surely, 2^1247992900 is an apocalyptic number.

1247992900 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 1247992900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716515136).

1247992900 is an abundant number, since it is smaller than the sum of its proper divisors (2185037372).

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

1247992900 is a wasteful number, since it uses less digits than its factorization.

1247992900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1247992900 is about 35326.9429755817. The cubic root of 1247992900 is about 1076.6404807037.

The spelling of 1247992900 in words is "one billion, two hundred forty-seven million, nine hundred ninety-two thousand, nine hundred".