42018440 has 32 divisors (see below), whose sum is σ = 96851160. Its totient is φ = 16396800.

The previous prime is 42018433. The next prime is 42018461. The reversal of 42018440 is 4481024.

It can be written as a sum of positive squares in 4 ways, for example, as 15413476 + 26604964 = 3926^2 + 5158^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11171 + ... + 14450.

Almost surely, 2^42018440 is an apocalyptic number.

42018440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42018440 is an abundant number, since it is smaller than the sum of its proper divisors (54832720).

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

42018440 is a wasteful number, since it uses less digits than its factorization.

42018440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25673 (or 25669 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 42018440 is about 6482.1632191731. The cubic root of 42018440 is about 347.6535284195.

Adding to 42018440 its reverse (4481024), we get a palindrome (46499464).

The spelling of 42018440 in words is "forty-two million, eighteen thousand, four hundred forty".