42139526 has 16 divisors (see below), whose sum is σ = 74260368. Its totient is φ = 17680800.

The previous prime is 42139501. The next prime is 42139529. The reversal of 42139526 is 62593124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 42139492 and 42139501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42139529) 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, 73385 + ... + 73956.

It is an arithmetic number, because the mean of its divisors is an integer number (4641273).

Almost surely, 2^42139526 is an apocalyptic number.

42139526 is a deficient number, since it is larger than the sum of its proper divisors (32120842).

42139526 is a wasteful number, since it uses less digits than its factorization.

42139526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147367.

The product of its digits is 12960, while the sum is 32.

The square root of 42139526 is about 6491.4964376483. The cubic root of 42139526 is about 347.9871565701.

The spelling of 42139526 in words is "forty-two million, one hundred thirty-nine thousand, five hundred twenty-six".