2455640 has 32 divisors (see below), whose sum is σ = 6028560. Its totient is φ = 892800.

The previous prime is 2455619. The next prime is 2455643. The reversal of 2455640 is 465542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2455643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2351 + ... + 3230.

2^2455640 is an apocalyptic number.

2455640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2455640 is an abundant number, since it is smaller than the sum of its proper divisors (3572920).

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

2455640 is a wasteful number, since it uses less digits than its factorization.

2455640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5599 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2455640 is about 1567.0481804973. The cubic root of 2455640 is about 134.9133417328.

It can be divided in two parts, 245 and 5640, that added together give a palindrome (5885).

The spelling of 2455640 in words is "two million, four hundred fifty-five thousand, six hundred forty".