2489945 has 4 divisors (see below), whose sum is σ = 2987940. Its totient is φ = 1991952.

The previous prime is 2489933. The next prime is 2489947. The reversal of 2489945 is 5499842.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5499842 = 2 ⋅2749921.

It can be written as a sum of positive squares in 2 ways, for example, as 1125721 + 1364224 = 1061^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 2489945 - 2⁶ = 2489881 is a prime.

It is a super-2 number, since 2×2489945² = 12399652206050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2489947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248990 + ... + 248999.

It is an arithmetic number, because the mean of its divisors is an integer number (746985).

2^2489945 is an apocalyptic number.

It is an amenable number.

2489945 is a deficient number, since it is larger than the sum of its proper divisors (497995).

2489945 is an equidigital number, since it uses as much as digits as its factorization.

2489945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497994.

The product of its digits is 103680, while the sum is 41.

The square root of 2489945 is about 1577.9559562928. The cubic root of 2489945 is about 135.5386798793.

The spelling of 2489945 in words is "two million, four hundred eighty-nine thousand, nine hundred forty-five".