5540643 has 18 divisors (see below), whose sum is σ = 8354892. Its totient is φ = 3669300.

The previous prime is 5540641. The next prime is 5540659. The reversal of 5540643 is 3460455.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 5540643 - 2¹ = 5540641 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (5540641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 36618 + ... + 36768.

Almost surely, 2^5540643 is an apocalyptic number.

5540643 is a deficient number, since it is larger than the sum of its proper divisors (2814249).

5540643 is an frugal number, since it uses more digits than its factorization.

5540643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 5540643 is about 2353.8570474861. The cubic root of 5540643 is about 176.9511499780.

Multiplying 5540643 by its sum of digits (27), we get a square (149597361 = 12231²).

5540643 divided by its sum of digits (27) gives a square (205209 = 453²).

The spelling of 5540643 in words is "five million, five hundred forty thousand, six hundred forty-three".