42961993 has 4 divisors (see below), whose sum is σ = 43184788. Its totient is φ = 42739200.

The previous prime is 42961987. The next prime is 42962011. The reversal of 42961993 is 39916924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6335289 + 36626704 = 2517^2 + 6052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42961993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42968993) 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, 111108 + ... + 111493.

It is an arithmetic number, because the mean of its divisors is an integer number (10796197).

Almost surely, 2^42961993 is an apocalyptic number.

It is an amenable number.

42961993 is a deficient number, since it is larger than the sum of its proper divisors (222795).

42961993 is a wasteful number, since it uses less digits than its factorization.

42961993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222794.

The product of its digits is 104976, while the sum is 43.

The square root of 42961993 is about 6554.5398770623. The cubic root of 42961993 is about 350.2365557285.

The spelling of 42961993 in words is "forty-two million, nine hundred sixty-one thousand, nine hundred ninety-three".