42938909 has 4 divisors (see below), whose sum is σ = 46241916. Its totient is φ = 39635904.

The previous prime is 42938899. The next prime is 42938921. The reversal of 42938909 is 90983924.

42938909 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 2 ways, for example, as 21576025 + 21362884 = 4645^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 42938909 - 2¹⁶ = 42873373 is a prime.

It is a super-2 number, since 2×42938909² = 3687499812220562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42938909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42938509) 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 in 3 ways as a sum of consecutive naturals, for example, 1651484 + ... + 1651509.

It is an arithmetic number, because the mean of its divisors is an integer number (11560479).

Almost surely, 2^42938909 is an apocalyptic number.

It is an amenable number.

42938909 is a deficient number, since it is larger than the sum of its proper divisors (3303007).

42938909 is a wasteful number, since it uses less digits than its factorization.

42938909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303006.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 42938909 is about 6552.7787235645. The cubic root of 42938909 is about 350.1738157068.

The spelling of 42938909 in words is "forty-two million, nine hundred thirty-eight thousand, nine hundred nine".