42190815 has 16 divisors (see below), whose sum is σ = 67586400. Its totient is φ = 22474752.

The previous prime is 42190769. The next prime is 42190847. The reversal of 42190815 is 51809124.

It is a happy number.

It is not a de Polignac number, because 42190815 - 2⁶ = 42190751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21391 + ... + 23279.

It is an arithmetic number, because the mean of its divisors is an integer number (4224150).

Almost surely, 2^42190815 is an apocalyptic number.

42190815 is a deficient number, since it is larger than the sum of its proper divisors (25395585).

42190815 is a wasteful number, since it uses less digits than its factorization.

42190815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 42190815 is about 6495.4457121894. The cubic root of 42190815 is about 348.1282804255.

Adding to 42190815 its reverse (51809124), we get a palindrome (93999939).

The spelling of 42190815 in words is "forty-two million, one hundred ninety thousand, eight hundred fifteen".