42140431 has 4 divisors (see below), whose sum is σ = 42196000. Its totient is φ = 42084864.

The previous prime is 42140419. The next prime is 42140443. The reversal of 42140431 is 13404124.

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

It is an interprime number because it is at equal distance from previous prime (42140419) and next prime (42140443).

It is a cyclic number.

It is not a de Polignac number, because 42140431 - 2⁷ = 42140303 is a prime.

It is a super-2 number, since 2×42140431² = 3551631849731522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42140399 and 42140408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42140401) 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, 26631 + ... + 28168.

It is an arithmetic number, because the mean of its divisors is an integer number (10549000).

Almost surely, 2^42140431 is an apocalyptic number.

42140431 is a deficient number, since it is larger than the sum of its proper divisors (55569).

42140431 is an equidigital number, since it uses as much as digits as its factorization.

42140431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55568.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 42140431 is about 6491.5661438516. The cubic root of 42140431 is about 347.9896477081.

Adding to 42140431 its reverse (13404124), we get a palindrome (55544555).

The spelling of 42140431 in words is "forty-two million, one hundred forty thousand, four hundred thirty-one".