42606391 has 4 divisors (see below), whose sum is σ = 42634512. Its totient is φ = 42578272.

The previous prime is 42606371. The next prime is 42606397. The reversal of 42606391 is 19360624.

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 42606391 - 2⁹ = 42605879 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42606397) 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, 11650 + ... + 14863.

It is an arithmetic number, because the mean of its divisors is an integer number (10658628).

Almost surely, 2^42606391 is an apocalyptic number.

42606391 is a deficient number, since it is larger than the sum of its proper divisors (28121).

42606391 is a wasteful number, since it uses less digits than its factorization.

42606391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28120.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42606391 is about 6527.3571221437. The cubic root of 42606391 is about 349.2675594567.

The spelling of 42606391 in words is "forty-two million, six hundred six thousand, three hundred ninety-one".