42400591 has 4 divisors (see below), whose sum is σ = 43768384. Its totient is φ = 41032800.

The previous prime is 42400577. The next prime is 42400607. The reversal of 42400591 is 19500424.

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 42400591 - 2¹⁵ = 42367823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42400531) 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, 683850 + ... + 683911.

It is an arithmetic number, because the mean of its divisors is an integer number (10942096).

Almost surely, 2^42400591 is an apocalyptic number.

42400591 is a deficient number, since it is larger than the sum of its proper divisors (1367793).

42400591 is a wasteful number, since it uses less digits than its factorization.

42400591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367792.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42400591 is about 6511.5736193335. The cubic root of 42400591 is about 348.7043003971.

The spelling of 42400591 in words is "forty-two million, four hundred thousand, five hundred ninety-one".