2640430 has 32 divisors (see below), whose sum is σ = 5392800. Its totient is φ = 922752.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640430 is 340462.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 2640398 and 2640407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936 + ... + 3004.

It is an arithmetic number, because the mean of its divisors is an integer number (168525).

2^2640430 is an apocalyptic number.

2640430 is an abundant number, since it is smaller than the sum of its proper divisors (2752370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640430 is a wasteful number, since it uses less digits than its factorization.

2640430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2640430 is about 1624.9399988923. The cubic root of 2640430 is about 138.2159679353.

Adding to 2640430 its reverse (340462), we get a palindrome (2980892).

Subtracting from 2640430 its reverse (340462), we obtain a cube (2299968 = 132³).

The spelling of 2640430 in words is "two million, six hundred forty thousand, four hundred thirty".