42967921 has 4 divisors (see below), whose sum is σ = 42997312. Its totient is φ = 42938532.

The previous prime is 42967919. The next prime is 42967943. The reversal of 42967921 is 12976924.

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 42967921 - 2¹ = 42967919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42967121) 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, 12381 + ... + 15466.

It is an arithmetic number, because the mean of its divisors is an integer number (10749328).

Almost surely, 2^42967921 is an apocalyptic number.

It is an amenable number.

42967921 is a deficient number, since it is larger than the sum of its proper divisors (29391).

42967921 is a wasteful number, since it uses less digits than its factorization.

42967921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29390.

The product of its digits is 54432, while the sum is 40.

The square root of 42967921 is about 6554.9920671195. The cubic root of 42967921 is about 350.2526638175.

The spelling of 42967921 in words is "forty-two million, nine hundred sixty-seven thousand, nine hundred twenty-one".