1245140172 has 144 divisors (see below), whose sum is σ = 3410534400. Its totient is φ = 382112640.

The previous prime is 1245140159. The next prime is 1245140219. The reversal of 1245140172 is 2710415421.

1245140172 is a `hidden beast` number, since 1 + 2 + 451 + 40 + 172 = 666.

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, 2556513 + ... + 2556999.

Almost surely, 2^1245140172 is an apocalyptic number.

1245140172 is a gapful number since it is divisible by the number (12) 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 1245140172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705267200).

1245140172 is an abundant number, since it is smaller than the sum of its proper divisors (2165394228).

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

1245140172 is a wasteful number, since it uses less digits than its factorization.

1245140172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1245140172 is about 35286.5437808806. The cubic root of 1245140172 is about 1075.8195076439.

Adding to 1245140172 its reverse (2710415421), we get a palindrome (3955555593).

The spelling of 1245140172 in words is "one billion, two hundred forty-five million, one hundred forty thousand, one hundred seventy-two".