42139692 has 36 divisors (see below), whose sum is σ = 121737616. Its totient is φ = 12039840.

The previous prime is 42139673. The next prime is 42139711. The reversal of 42139692 is 29693124.

It is an interprime number because it is at equal distance from previous prime (42139673) and next prime (42139711).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83359 + ... + 83862.

Almost surely, 2^42139692 is an apocalyptic number.

42139692 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

42139692 is an abundant number, since it is smaller than the sum of its proper divisors (79597924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42139692 is a wasteful number, since it uses less digits than its factorization.

42139692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167238 (or 167233 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 42139692 is about 6491.5092235935. The cubic root of 42139692 is about 347.9876135108.

The spelling of 42139692 in words is "forty-two million, one hundred thirty-nine thousand, six hundred ninety-two".