1252705100 has 72 divisors (see below), whose sum is σ = 2792612928. Its totient is φ = 487526400.

The previous prime is 1252705079. The next prime is 1252705109. The reversal of 1252705100 is 15072521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1252705109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 906410 + ... + 907790.

Almost surely, 2^1252705100 is an apocalyptic number.

1252705100 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 1252705100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396306464).

1252705100 is an abundant number, since it is smaller than the sum of its proper divisors (1539907828).

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

1252705100 is a wasteful number, since it uses less digits than its factorization.

1252705100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 1252705100 is about 35393.5742755659. The cubic root of 1252705100 is about 1077.9938466518.

Adding to 1252705100 its reverse (15072521), we get a palindrome (1267777621).

The spelling of 1252705100 in words is "one billion, two hundred fifty-two million, seven hundred five thousand, one hundred".