42819440 has 20 divisors (see below), whose sum is σ = 99555384. Its totient is φ = 17127744.

The previous prime is 42819433. The next prime is 42819509. The reversal of 42819440 is 4491824.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 42819397 and 42819406.

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, 267542 + ... + 267701.

Almost surely, 2^42819440 is an apocalyptic number.

42819440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42819440 is an abundant number, since it is smaller than the sum of its proper divisors (56735944).

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

42819440 is a wasteful number, since it uses less digits than its factorization.

42819440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535256 (or 535250 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 42819440 is about 6543.6564702007. The cubic root of 42819440 is about 349.8487509752.

The spelling of 42819440 in words is "forty-two million, eight hundred nineteen thousand, four hundred forty".