42220040 has 16 divisors (see below), whose sum is σ = 94995180. Its totient is φ = 16888000.

The previous prime is 42219979. The next prime is 42220081. The reversal of 42220040 is 4002224.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41550916 + 669124 = 6446^2 + 818^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42219997 and 42220024.

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, 527711 + ... + 527790.

Almost surely, 2^42220040 is an apocalyptic number.

42220040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42220040 is an abundant number, since it is smaller than the sum of its proper divisors (52775140).

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

42220040 is a wasteful number, since it uses less digits than its factorization.

42220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055512 (or 1055508 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 42220040 is about 6497.6949759126. The cubic root of 42220040 is about 348.2086431045.

Adding to 42220040 its reverse (4002224), we get a palindrome (46222264).

The spelling of 42220040 in words is "forty-two million, two hundred twenty thousand, forty".