42619991 has 4 divisors (see below), whose sum is σ = 42640872. Its totient is φ = 42599112.

The previous prime is 42619987. The next prime is 42619999. The reversal of 42619991 is 19991624.

It is a happy number.

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 42619991 - 2² = 42619987 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 (42619999) 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, 7001 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (10660218).

Almost surely, 2^42619991 is an apocalyptic number.

42619991 is a deficient number, since it is larger than the sum of its proper divisors (20881).

42619991 is a wasteful number, since it uses less digits than its factorization.

42619991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20880.

The product of its digits is 34992, while the sum is 41.

The square root of 42619991 is about 6528.3988082837. The cubic root of 42619991 is about 349.3047176809.

The spelling of 42619991 in words is "forty-two million, six hundred nineteen thousand, nine hundred ninety-one".