42090072 has 16 divisors (see below), whose sum is σ = 105225240. Its totient is φ = 14030016.

The previous prime is 42090071. The next prime is 42090091. The reversal of 42090072 is 27009024.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1753753 = 42090072 / (4 + 2 + 0 + 9 + 0 + 0 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42090071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876853 + ... + 876900.

Almost surely, 2^42090072 is an apocalyptic number.

It is an amenable number.

42090072 is an abundant number, since it is smaller than the sum of its proper divisors (63135168).

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

42090072 is a wasteful number, since it uses less digits than its factorization.

42090072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753762 (or 1753758 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 42090072 is about 6487.6861822995. The cubic root of 42090072 is about 347.8509733154.

Adding to 42090072 its reverse (27009024), we get a palindrome (69099096).

The spelling of 42090072 in words is "forty-two million, ninety thousand, seventy-two".