42423515 has 4 divisors (see below), whose sum is σ = 50908224. Its totient is φ = 33938808.

The previous prime is 42423509. The next prime is 42423527. The reversal of 42423515 is 51532424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42423515 - 2¹⁶ = 42357979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242347 + ... + 4242356.

It is an arithmetic number, because the mean of its divisors is an integer number (12727056).

Almost surely, 2^42423515 is an apocalyptic number.

42423515 is a deficient number, since it is larger than the sum of its proper divisors (8484709).

42423515 is an equidigital number, since it uses as much as digits as its factorization.

42423515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484708.

The product of its digits is 4800, while the sum is 26.

The square root of 42423515 is about 6513.3336318663. Note that the first 3 decimals coincide. The cubic root of 42423515 is about 348.7671317321.

Adding to 42423515 its reverse (51532424), we get a palindrome (93955939).

It can be divided in two parts, 42 and 423515, that multiplied together give a triangular number (17787630 = T₅₉₆₄).

The spelling of 42423515 in words is "forty-two million, four hundred twenty-three thousand, five hundred fifteen".