42139980 has 96 divisors (see below), whose sum is σ = 133022400. Its totient is φ = 11073024.

The previous prime is 42139973. The next prime is 42140017. The reversal of 42139980 is 8993124.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38886 + ... + 39954.

It is an arithmetic number, because the mean of its divisors is an integer number (1385650).

Almost surely, 2^42139980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42139980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66511200).

42139980 is an abundant number, since it is smaller than the sum of its proper divisors (90882420).

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

42139980 is a wasteful number, since it uses less digits than its factorization.

42139980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 42139980 is about 6491.5314063786. The cubic root of 42139980 is about 347.9884062725.

It can be divided in two parts, 421 and 39980, that added together give a square (40401 = 201²).

The spelling of 42139980 in words is "forty-two million, one hundred thirty-nine thousand, nine hundred eighty".