42666989 has 4 divisors (see below), whose sum is σ = 44912640. Its totient is φ = 40421340.

The previous prime is 42666983. The next prime is 42667003. The reversal of 42666989 is 98966624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42666989 - 2⁸ = 42666733 is a prime.

It is a super-2 number, since 2×42666989² = 3640943900652242, 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 (42666983) 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, 1122797 + ... + 1122834.

It is an arithmetic number, because the mean of its divisors is an integer number (11228160).

Almost surely, 2^42666989 is an apocalyptic number.

It is an amenable number.

42666989 is a deficient number, since it is larger than the sum of its proper divisors (2245651).

42666989 is a wasteful number, since it uses less digits than its factorization.

42666989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245650.

The product of its digits is 1119744, while the sum is 50.

The square root of 42666989 is about 6531.9973208813. The cubic root of 42666989 is about 349.4330658426.

The spelling of 42666989 in words is "forty-two million, six hundred sixty-six thousand, nine hundred eighty-nine".