42539541 has 8 divisors (see below), whose sum is σ = 61875744. Its totient is φ = 25781520.

The previous prime is 42539527. The next prime is 42539543. The reversal of 42539541 is 14593524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42539541 - 2⁶ = 42539477 is a prime.

It is a super-2 number, since 2×42539541² = 3619225096981362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1289077 = 42539541 / (4 + 2 + 5 + 3 + 9 + 5 + 4 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42539543) 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, 644506 + ... + 644571.

It is an arithmetic number, because the mean of its divisors is an integer number (7734468).

Almost surely, 2^42539541 is an apocalyptic number.

It is an amenable number.

42539541 is a deficient number, since it is larger than the sum of its proper divisors (19336203).

42539541 is a wasteful number, since it uses less digits than its factorization.

42539541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289091.

The product of its digits is 21600, while the sum is 33.

The square root of 42539541 is about 6522.2343564150. The cubic root of 42539541 is about 349.0847953388.

The spelling of 42539541 in words is "forty-two million, five hundred thirty-nine thousand, five hundred forty-one".