42312440 has 32 divisors (see below), whose sum is σ = 96822000. Its totient is φ = 16637184.

The previous prime is 42312437. The next prime is 42312481. The reversal of 42312440 is 4421324.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 6605 + ... + 11324.

Almost surely, 2^42312440 is an apocalyptic number.

42312440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42312440 is an abundant number, since it is smaller than the sum of its proper divisors (54509560).

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

42312440 is a wasteful number, since it uses less digits than its factorization.

42312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17999 (or 17995 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 42312440 is about 6504.8013036526. The cubic root of 42312440 is about 348.4624801881.

Adding to 42312440 its reverse (4421324), we get a palindrome (46733764).

The spelling of 42312440 in words is "forty-two million, three hundred twelve thousand, four hundred forty".