455640 has 32 divisors (see below), whose sum is σ = 1367280. Its totient is φ = 121472.

The previous prime is 455627. The next prime is 455647. The reversal of 455640 is 46554.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 455640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455647) by changing a digit.

455640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779 + ... + 2018.

2⁴⁵⁵⁶⁴⁰ is an apocalyptic number.

455640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

455640 is an abundant number, since it is smaller than the sum of its proper divisors (911640).

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

455640 is a wasteful number, since it uses less digits than its factorization.

455640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811 (or 3807 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 455640 is about 675.0111110197. The cubic root of 455640 is about 76.9497620238.

The spelling of 455640 in words is "four hundred fifty-five thousand, six hundred forty".