42749145 has 24 divisors (see below), whose sum is σ = 78000000. Its totient is φ = 21599136.

The previous prime is 42749141. The next prime is 42749167. The reversal of 42749145 is 54194724.

It is a happy number.

It is not a de Polignac number, because 42749145 - 2² = 42749141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42749141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24145 + ... + 25854.

It is an arithmetic number, because the mean of its divisors is an integer number (3250000).

Almost surely, 2^42749145 is an apocalyptic number.

42749145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42749145 is a deficient number, since it is larger than the sum of its proper divisors (35250855).

42749145 is a wasteful number, since it uses less digits than its factorization.

42749145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50029 (or 50026 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 42749145 is about 6538.2830314999. The cubic root of 42749145 is about 349.6572017800.

The spelling of 42749145 in words is "forty-two million, seven hundred forty-nine thousand, one hundred forty-five".