2623509 has 30 divisors (see below), whose sum is σ = 4565814. Its totient is φ = 1496880.

The previous prime is 2623487. The next prime is 2623529. The reversal of 2623509 is 9053262.

It can be written as a sum of positive squares in only one way, i.e., 2480625 + 142884 = 1575^2 + 378^2 .

It is not a de Polignac number, because 2623509 - 2⁵ = 2623477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2623529) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3639 + ... + 4299.

2^2623509 is an apocalyptic number.

It is an amenable number.

2623509 is a deficient number, since it is larger than the sum of its proper divisors (1942305).

2623509 is an equidigital number, since it uses as much as digits as its factorization.

2623509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 2623509 is about 1619.7249766550. The cubic root of 2623509 is about 137.9200860570.

The spelling of 2623509 in words is "two million, six hundred twenty-three thousand, five hundred nine".