42733521 has 16 divisors (see below), whose sum is σ = 64854720. Its totient is φ = 27793440.

The previous prime is 42733507. The next prime is 42733573. The reversal of 42733521 is 12533724.

It is not a de Polignac number, because 42733521 - 2¹⁴ = 42717137 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42733591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18195 + ... + 20408.

It is an arithmetic number, because the mean of its divisors is an integer number (4053420).

Almost surely, 2^42733521 is an apocalyptic number.

42733521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42733521 is a deficient number, since it is larger than the sum of its proper divisors (22121199).

42733521 is a wasteful number, since it uses less digits than its factorization.

42733521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38653 (or 38647 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 42733521 is about 6537.0881132198. The cubic root of 42733521 is about 349.6145989021.

The spelling of 42733521 in words is "forty-two million, seven hundred thirty-three thousand, five hundred twenty-one".