42387909 has 4 divisors (see below), whose sum is σ = 56517216. Its totient is φ = 28258604.

The previous prime is 42387883. The next prime is 42387913. The reversal of 42387909 is 90978324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42387909 - 2¹⁵ = 42355141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42387949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7064649 + ... + 7064654.

It is an arithmetic number, because the mean of its divisors is an integer number (14129304).

Almost surely, 2^42387909 is an apocalyptic number.

It is an amenable number.

42387909 is a deficient number, since it is larger than the sum of its proper divisors (14129307).

42387909 is a wasteful number, since it uses less digits than its factorization.

42387909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14129306.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 42387909 is about 6510.5997419593. The cubic root of 42387909 is about 348.6695311576.

The spelling of 42387909 in words is "forty-two million, three hundred eighty-seven thousand, nine hundred nine".