2145975 has 48 divisors (see below), whose sum is σ = 3999744. Its totient is φ = 1008000.

The previous prime is 2145953. The next prime is 2145977. The reversal of 2145975 is 5795412.

It is not a de Polignac number, because 2145975 - 2¹⁰ = 2144951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30190 + ... + 30260.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2^2145975 is an apocalyptic number.

2145975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2145975 is a deficient number, since it is larger than the sum of its proper divisors (1853769).

2145975 is a wasteful number, since it uses less digits than its factorization.

2145975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 123 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 2145975 is about 1464.9146732831. The cubic root of 2145975 is about 128.9856963889.

The spelling of 2145975 in words is "two million, one hundred forty-five thousand, nine hundred seventy-five".