1245409872 has 360 divisors, whose sum is σ = 4211114400. Its totient is φ = 314979840.

The previous prime is 1245409831. The next prime is 1245409889. The reversal of 1245409872 is 2789045421.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40174497 + ... + 40174527.

It is an arithmetic number, because the mean of its divisors is an integer number (11697540).

Almost surely, 2^1245409872 is an apocalyptic number.

1245409872 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 1245409872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2105557200).

1245409872 is an abundant number, since it is smaller than the sum of its proper divisors (2965704528).

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

1245409872 is a wasteful number, since it uses less digits than its factorization.

1245409872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 1245409872 is about 35290.3651440446. The cubic root of 1245409872 is about 1075.8971769648.

The spelling of 1245409872 in words is "one billion, two hundred forty-five million, four hundred nine thousand, eight hundred seventy-two".