42207749 has 8 divisors (see below), whose sum is σ = 42611712. Its totient is φ = 41806080.

The previous prime is 42207727. The next prime is 42207751. The reversal of 42207749 is 94770224.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42207749 - 2¹² = 42203653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42207779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73634 + ... + 74204.

It is an arithmetic number, because the mean of its divisors is an integer number (5326464).

Almost surely, 2^42207749 is an apocalyptic number.

It is an amenable number.

42207749 is a deficient number, since it is larger than the sum of its proper divisors (403963).

42207749 is a wasteful number, since it uses less digits than its factorization.

42207749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 42207749 is about 6496.7491101319. The cubic root of 42207749 is about 348.1748499278.

The spelling of 42207749 in words is "forty-two million, two hundred seven thousand, seven hundred forty-nine".