42693981 has 8 divisors (see below), whose sum is σ = 62100384. Its totient is φ = 25875120.

The previous prime is 42693947. The next prime is 42694027. The reversal of 42693981 is 18939624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42693981 - 2¹⁰ = 42692957 is a prime.

It is a super-2 number, since 2×42693981² = 3645552027256722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42693901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646846 + ... + 646911.

It is an arithmetic number, because the mean of its divisors is an integer number (7762548).

Almost surely, 2^42693981 is an apocalyptic number.

It is an amenable number.

42693981 is a deficient number, since it is larger than the sum of its proper divisors (19406403).

42693981 is a wasteful number, since it uses less digits than its factorization.

42693981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293771.

The product of its digits is 93312, while the sum is 42.

The square root of 42693981 is about 6534.0631310081. The cubic root of 42693981 is about 349.5067364507.

The spelling of 42693981 in words is "forty-two million, six hundred ninety-three thousand, nine hundred eighty-one".