42661239 has 16 divisors (see below), whose sum is σ = 58890240. Its totient is φ = 27442080.

The previous prime is 42661207. The next prime is 42661243. The reversal of 42661239 is 93216624.

It is not a de Polignac number, because 42661239 - 2⁵ = 42661207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42661039) 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, 59817 + ... + 60525.

It is an arithmetic number, because the mean of its divisors is an integer number (3680640).

Almost surely, 2^42661239 is an apocalyptic number.

42661239 is a deficient number, since it is larger than the sum of its proper divisors (16229001).

42661239 is a wasteful number, since it uses less digits than its factorization.

42661239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390.

The product of its digits is 15552, while the sum is 33.

The square root of 42661239 is about 6531.5571650258. The cubic root of 42661239 is about 349.4173680675.

The spelling of 42661239 in words is "forty-two million, six hundred sixty-one thousand, two hundred thirty-nine".