42312220 has 24 divisors (see below), whose sum is σ = 90748224. Its totient is φ = 16564416.

The previous prime is 42312217. The next prime is 42312239. The reversal of 42312220 is 2221324.

It is a super-2 number, since 2×42312220² = 3580647922656800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42312194 and 42312203.

It is a congruent number.

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, 21567 + ... + 23446.

It is an arithmetic number, because the mean of its divisors is an integer number (3781176).

Almost surely, 2^42312220 is an apocalyptic number.

It is an amenable number.

42312220 is an abundant number, since it is smaller than the sum of its proper divisors (48436004).

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

42312220 is a wasteful number, since it uses less digits than its factorization.

42312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45069 (or 45067 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42312220 is about 6504.7843930449. The cubic root of 42312220 is about 348.4618762532.

Adding to 42312220 its reverse (2221324), we get a palindrome (44533544).

The spelling of 42312220 in words is "forty-two million, three hundred twelve thousand, two hundred twenty".