2145572 has 48 divisors (see below), whose sum is σ = 4591104. Its totient is φ = 871200.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145572 is 2755412.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 69197 + ... + 69227.

It is an arithmetic number, because the mean of its divisors is an integer number (95648).

2^2145572 is an apocalyptic number.

2145572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2145572 is an abundant number, since it is smaller than the sum of its proper divisors (2445532).

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

2145572 is a wasteful number, since it uses less digits than its factorization.

2145572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 57 counting only the distinct ones).

The product of its digits is 2800, while the sum is 26.

The square root of 2145572 is about 1464.7771161511. Note that the first 3 decimals coincide. The cubic root of 2145572 is about 128.9776216615.

The spelling of 2145572 in words is "two million, one hundred forty-five thousand, five hundred seventy-two".