42139489 has 16 divisors (see below), whose sum is σ = 49102848. Its totient is φ = 35420112.

The previous prime is 42139451. The next prime is 42139499. The reversal of 42139489 is 98493124.

It is a de Polignac number, because none of the positive numbers 2^k-42139489 is a prime.

It is a super-2 number, since 2×42139489² = 3551473066362242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42139429) 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, 94902 + ... + 95344.

It is an arithmetic number, because the mean of its divisors is an integer number (3068928).

Almost surely, 2^42139489 is an apocalyptic number.

It is an amenable number.

42139489 is a deficient number, since it is larger than the sum of its proper divisors (6963359).

42139489 is a wasteful number, since it uses less digits than its factorization.

42139489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its digits is 62208, while the sum is 40.

The square root of 42139489 is about 6491.4935877655. The cubic root of 42139489 is about 347.9870547217.

The spelling of 42139489 in words is "forty-two million, one hundred thirty-nine thousand, four hundred eighty-nine".