42204991 has 4 divisors (see below), whose sum is σ = 42640192. Its totient is φ = 41769792.

The previous prime is 42204989. The next prime is 42204997. The reversal of 42204991 is 19940224.

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 42204991 - 2¹ = 42204989 is a prime.

It is a super-2 number, since 2×42204991² = 3562522530620162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42204997) 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, 217455 + ... + 217648.

It is an arithmetic number, because the mean of its divisors is an integer number (10660048).

Almost surely, 2^42204991 is an apocalyptic number.

42204991 is a deficient number, since it is larger than the sum of its proper divisors (435201).

42204991 is an equidigital number, since it uses as much as digits as its factorization.

42204991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435200.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 42204991 is about 6496.5368466591. The cubic root of 42204991 is about 348.1672661138.

The spelling of 42204991 in words is "forty-two million, two hundred four thousand, nine hundred ninety-one".