2643925 has 12 divisors (see below), whose sum is σ = 3471876. Its totient is φ = 1990400.

The previous prime is 2643917. The next prime is 2643943. The reversal of 2643925 is 5293462.

2643925 = 205² + 206² + ... + 254².

It can be written as a sum of positive squares in 6 ways, for example, as 213444 + 2430481 = 462^2 + 1559^2 .

It is not a de Polignac number, because 2643925 - 2³ = 2643917 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6² + 4⁴ + 3¹³ + 9³ + 2¹⁹ + 5 .

2643925 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2686 + ... + 3535.

It is an arithmetic number, because the mean of its divisors is an integer number (289323).

2^2643925 is an apocalyptic number.

2643925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2643925 is a deficient number, since it is larger than the sum of its proper divisors (827951).

2643925 is a wasteful number, since it uses less digits than its factorization.

2643925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248 (or 6243 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 2643925 is about 1626.0150675809. The cubic root of 2643925 is about 138.2769241468.

The spelling of 2643925 in words is "two million, six hundred forty-three thousand, nine hundred twenty-five".