42890042 has 16 divisors (see below), whose sum is σ = 69795432. Its totient is φ = 19649280.

The previous prime is 42890033. The next prime is 42890051. The reversal of 42890042 is 24009824.

It is an interprime number because it is at equal distance from previous prime (42890033) and next prime (42890051).

It can be written as a sum of positive squares in 4 ways, for example, as 33884041 + 9006001 = 5821^2 + 3001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42889987 and 42890014.

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, 2459 + ... + 9582.

Almost surely, 2^42890042 is an apocalyptic number.

42890042 is a deficient number, since it is larger than the sum of its proper divisors (26905390).

42890042 is a wasteful number, since it uses less digits than its factorization.

42890042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12193.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 42890042 is about 6549.0489385864. The cubic root of 42890042 is about 350.0409258266.

Adding to 42890042 its reverse (24009824), we get a palindrome (66899866).

The spelling of 42890042 in words is "forty-two million, eight hundred ninety thousand, forty-two".