42749645 has 8 divisors (see below), whose sum is σ = 54317304. Its totient is φ = 32187904.

The previous prime is 42749621. The next prime is 42749659. The reversal of 42749645 is 54694724.

42749645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 23687689 + 19061956 = 4867^2 + 4366^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42749645 is a prime.

It is a super-3 number, since 3×42749645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251384 + ... + 251553.

It is an arithmetic number, because the mean of its divisors is an integer number (6789663).

Almost surely, 2^42749645 is an apocalyptic number.

It is an amenable number.

42749645 is a deficient number, since it is larger than the sum of its proper divisors (11567659).

42749645 is a wasteful number, since it uses less digits than its factorization.

42749645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502959.

The product of its digits is 241920, while the sum is 41.

The square root of 42749645 is about 6538.3212677261. The cubic root of 42749645 is about 349.6585649879.

The spelling of 42749645 in words is "forty-two million, seven hundred forty-nine thousand, six hundred forty-five".