2640129 has 4 divisors (see below), whose sum is σ = 3520176. Its totient is φ = 1760084.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640129 is 9210462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2640129 - 2⁸ = 2639873 is a prime.

It is a super-2 number, since 2×2640129² = 13940562273282, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

2640129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2640099 and 2640108.

It is not an unprimeable number, because it can be changed into a prime (2640139) 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, 440019 + ... + 440024.

It is an arithmetic number, because the mean of its divisors is an integer number (880044).

2^2640129 is an apocalyptic number.

It is an amenable number.

2640129 is a deficient number, since it is larger than the sum of its proper divisors (880047).

2640129 is an equidigital number, since it uses as much as digits as its factorization.

2640129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880046.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2640129 is about 1624.8473774481. The cubic root of 2640129 is about 138.2107156863.

The spelling of 2640129 in words is "two million, six hundred forty thousand, one hundred twenty-nine".