1145279872 has 128 divisors (see below), whose sum is σ = 2706508800. Its totient is φ = 476928000.

The previous prime is 1145279801. The next prime is 1145279893. The reversal of 1145279872 is 2789725411.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828622 + ... + 830002.

It is an arithmetic number, because the mean of its divisors is an integer number (21144600).

Almost surely, 2^1145279872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1145279872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353254400).

1145279872 is an abundant number, since it is smaller than the sum of its proper divisors (1561228928).

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

1145279872 is a wasteful number, since it uses less digits than its factorization.

1145279872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1444 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 1145279872 is about 33841.9838661979. The cubic root of 1145279872 is about 1046.2541879267.

The spelling of 1145279872 in words is "one billion, one hundred forty-five million, two hundred seventy-nine thousand, eight hundred seventy-two".