42725891 has 4 divisors (see below), whose sum is σ = 46012512. Its totient is φ = 39439272.

The previous prime is 42725863. The next prime is 42725911. The reversal of 42725891 is 19852724.

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 42725891 - 2¹⁰ = 42724867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42725821) 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, 1643291 + ... + 1643316.

It is an arithmetic number, because the mean of its divisors is an integer number (11503128).

Almost surely, 2^42725891 is an apocalyptic number.

42725891 is a deficient number, since it is larger than the sum of its proper divisors (3286621).

42725891 is a wasteful number, since it uses less digits than its factorization.

42725891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286620.

The product of its digits is 40320, while the sum is 38.

The square root of 42725891 is about 6536.5044939937. The cubic root of 42725891 is about 349.5937899595.

The spelling of 42725891 in words is "forty-two million, seven hundred twenty-five thousand, eight hundred ninety-one".