3642840 has 64 divisors (see below), whose sum is σ = 12146400. Its totient is φ = 971136.

The previous prime is 3642839. The next prime is 3642883. The reversal of 3642840 is 482463.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607 + ... + 2766.

Almost surely, 2^3642840 is an apocalyptic number.

3642840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3642840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6073200).

3642840 is an abundant number, since it is smaller than the sum of its proper divisors (8503560).

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

3642840 is a wasteful number, since it uses less digits than its factorization.

3642840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393 (or 3383 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 3642840 is about 1908.6225399486. The cubic root of 3642840 is about 153.8674296217.

The spelling of 3642840 in words is "three million, six hundred forty-two thousand, eight hundred forty".