1244640100 has 36 divisors (see below), whose sum is σ = 2946405168. Its totient is φ = 452596000.

The previous prime is 1244640071. The next prime is 1244640113. The reversal of 1244640100 is 10464421.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 564646 + ... + 566845.

It is an arithmetic number, because the mean of its divisors is an integer number (81844588).

Almost surely, 2^1244640100 is an apocalyptic number.

1244640100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244640100 is an abundant number, since it is smaller than the sum of its proper divisors (1701765068).

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

1244640100 is a wasteful number, since it uses less digits than its factorization.

1244640100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131516 (or 1131509 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1244640100 is about 35279.4571953708. The cubic root of 1244640100 is about 1075.6754651596.

The spelling of 1244640100 in words is "one billion, two hundred forty-four million, six hundred forty thousand, one hundred".