42021456 has 20 divisors (see below), whose sum is σ = 108555552. Its totient is φ = 14007136.

The previous prime is 42021401. The next prime is 42021509. The reversal of 42021456 is 65412024.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437676 + ... + 437771.

Almost surely, 2^42021456 is an apocalyptic number.

It is an amenable number.

42021456 is an abundant number, since it is smaller than the sum of its proper divisors (66534096).

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

42021456 is a wasteful number, since it uses less digits than its factorization.

42021456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875458 (or 875452 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 42021456 is about 6482.3958533863. The cubic root of 42021456 is about 347.6618461800.

The spelling of 42021456 in words is "forty-two million, twenty-one thousand, four hundred fifty-six".