42905391 has 4 divisors (see below), whose sum is σ = 57207192. Its totient is φ = 28603592.

The previous prime is 42905389. The next prime is 42905411. The reversal of 42905391 is 19350924.

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

It is a cyclic number.

It is not a de Polignac number, because 42905391 - 2¹ = 42905389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42905321) 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, 7150896 + ... + 7150901.

It is an arithmetic number, because the mean of its divisors is an integer number (14301798).

Almost surely, 2^42905391 is an apocalyptic number.

42905391 is a deficient number, since it is larger than the sum of its proper divisors (14301801).

42905391 is a wasteful number, since it uses less digits than its factorization.

42905391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14301800.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 42905391 is about 6550.2206833053. The cubic root of 42905391 is about 350.0826770671.

The spelling of 42905391 in words is "forty-two million, nine hundred five thousand, three hundred ninety-one".