42143979 has 4 divisors (see below), whose sum is σ = 56191976. Its totient is φ = 28095984.

The previous prime is 42143971. The next prime is 42143987. The reversal of 42143979 is 97934124.

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 (42143971) and next prime (42143987).

It is not a de Polignac number, because 42143979 - 2³ = 42143971 is a prime.

It is a super-2 number, since 2×42143979² = 3552229931904882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42143971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7023994 + ... + 7023999.

It is an arithmetic number, because the mean of its divisors is an integer number (14047994).

Almost surely, 2^42143979 is an apocalyptic number.

42143979 is a deficient number, since it is larger than the sum of its proper divisors (14047997).

42143979 is a wasteful number, since it uses less digits than its factorization.

42143979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14047996.

The product of its digits is 54432, while the sum is 39.

The square root of 42143979 is about 6491.8394157588. The cubic root of 42143979 is about 347.9994137261. Note that the first 3 decimals are identical.

The spelling of 42143979 in words is "forty-two million, one hundred forty-three thousand, nine hundred seventy-nine".