42001428 has 72 divisors (see below), whose sum is σ = 115971744. Its totient is φ = 11793600.

The previous prime is 42001397. The next prime is 42001447. The reversal of 42001428 is 82410024.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35283 + ... + 36453.

Almost surely, 2^42001428 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 42001428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57985872).

42001428 is an abundant number, since it is smaller than the sum of its proper divisors (73970316).

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

42001428 is a wasteful number, since it uses less digits than its factorization.

42001428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 42001428 is about 6480.8508700633. The cubic root of 42001428 is about 347.6066039409.

The spelling of 42001428 in words is "forty-two million, one thousand, four hundred twenty-eight".