42808749 has 8 divisors (see below), whose sum is σ = 57643872. Its totient is φ = 28256400.

The previous prime is 42808699. The next prime is 42808781. The reversal of 42808749 is 94780824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42808749 - 2⁷ = 42808621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42808749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42808849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70339 + ... + 70944.

It is an arithmetic number, because the mean of its divisors is an integer number (7205484).

Almost surely, 2^42808749 is an apocalyptic number.

It is an amenable number.

42808749 is a deficient number, since it is larger than the sum of its proper divisors (14835123).

42808749 is a wasteful number, since it uses less digits than its factorization.

42808749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141387.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 42808749 is about 6542.8395211865. The cubic root of 42808749 is about 349.8196322359.

The spelling of 42808749 in words is "forty-two million, eight hundred eight thousand, seven hundred forty-nine".