42750909 has 10 divisors (see below), whose sum is σ = 63862590. Its totient is φ = 28500552.

The previous prime is 42750899. The next prime is 42750919. The reversal of 42750909 is 90905724.

It is an interprime number because it is at equal distance from previous prime (42750899) and next prime (42750919).

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 4743684 = 6165^2 + 2178^2 .

It is not a de Polignac number, because 42750909 - 2¹² = 42746813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42750919) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 263814 + ... + 263975.

It is an arithmetic number, because the mean of its divisors is an integer number (6386259).

Almost surely, 2^42750909 is an apocalyptic number.

It is an amenable number.

42750909 is a deficient number, since it is larger than the sum of its proper divisors (21111681).

42750909 is an equidigital number, since it uses as much as digits as its factorization.

42750909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527801 (or 527792 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 42750909 is about 6538.4179279089. The cubic root of 42750909 is about 349.6620111301.

The spelling of 42750909 in words is "forty-two million, seven hundred fifty thousand, nine hundred nine".