42749626 has 4 divisors (see below), whose sum is σ = 64124442. Its totient is φ = 21374812.

The previous prime is 42749621. The next prime is 42749659. The reversal of 42749626 is 62694724.

42749626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41615401 + 1134225 = 6451^2 + 1065^2 .

It is not an unprimeable number, because it can be changed into a prime (42749621) by changing a digit.

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 as a sum of consecutive naturals, namely, 10687405 + ... + 10687408.

Almost surely, 2^42749626 is an apocalyptic number.

42749626 is a deficient number, since it is larger than the sum of its proper divisors (21374816).

42749626 is a wasteful number, since it uses less digits than its factorization.

42749626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21374815.

The product of its digits is 145152, while the sum is 40.

The square root of 42749626 is about 6538.3198147536. The cubic root of 42749626 is about 349.6585131862.

The spelling of 42749626 in words is "forty-two million, seven hundred forty-nine thousand, six hundred twenty-six".