42012643 has 4 divisors (see below), whose sum is σ = 42149800. Its totient is φ = 41875488.

The previous prime is 42012637. The next prime is 42012647. The reversal of 42012643 is 34621024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42012643 - 2¹³ = 42004451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42012647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68118 + ... + 68731.

It is an arithmetic number, because the mean of its divisors is an integer number (10537450).

Almost surely, 2^42012643 is an apocalyptic number.

42012643 is a deficient number, since it is larger than the sum of its proper divisors (137157).

42012643 is a wasteful number, since it uses less digits than its factorization.

42012643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137156.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42012643 is about 6481.7160536389. The cubic root of 42012643 is about 347.6375398822.

Adding to 42012643 its reverse (34621024), we get a palindrome (76633667).

The spelling of 42012643 in words is "forty-two million, twelve thousand, six hundred forty-three".