42139756 has 6 divisors (see below), whose sum is σ = 73744580. Its totient is φ = 21069876.

The previous prime is 42139751. The next prime is 42139771. The reversal of 42139756 is 65793124.

It is not an unprimeable number, because it can be changed into a prime (42139751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5267466 + ... + 5267473.

Almost surely, 2^42139756 is an apocalyptic number.

It is an amenable number.

42139756 is a deficient number, since it is larger than the sum of its proper divisors (31604824).

42139756 is a wasteful number, since it uses less digits than its factorization.

42139756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10534943 (or 10534941 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 42139756 is about 6491.5141531079. The cubic root of 42139756 is about 347.9877896804.

The spelling of 42139756 in words is "forty-two million, one hundred thirty-nine thousand, seven hundred fifty-six".