42239920 has 40 divisors (see below), whose sum is σ = 98609760. Its totient is φ = 16826880.

The previous prime is 42239893. The next prime is 42239927. The reversal of 42239920 is 2993224.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42239927) 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, 21541 + ... + 23419.

It is an arithmetic number, because the mean of its divisors is an integer number (2465244).

Almost surely, 2^42239920 is an apocalyptic number.

42239920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42239920 is an abundant number, since it is smaller than the sum of its proper divisors (56369840).

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

42239920 is a wasteful number, since it uses less digits than its factorization.

42239920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42239920 is about 6499.2245691313. The cubic root of 42239920 is about 348.2632877835.

The spelling of 42239920 in words is "forty-two million, two hundred thirty-nine thousand, nine hundred twenty".