42406251 has 4 divisors (see below), whose sum is σ = 56541672. Its totient is φ = 28270832.

The previous prime is 42406229. The next prime is 42406261. The reversal of 42406251 is 15260424.

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 42406251 - 2⁵ = 42406219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42406261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7067706 + ... + 7067711.

It is an arithmetic number, because the mean of its divisors is an integer number (14135418).

Almost surely, 2^42406251 is an apocalyptic number.

42406251 is a deficient number, since it is larger than the sum of its proper divisors (14135421).

42406251 is a wasteful number, since it uses less digits than its factorization.

42406251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14135420.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 42406251 is about 6512.0082155968. The cubic root of 42406251 is about 348.7198157353.

Adding to 42406251 its reverse (15260424), we get a palindrome (57666675).

The spelling of 42406251 in words is "forty-two million, four hundred six thousand, two hundred fifty-one".