42233781 has 4 divisors (see below), whose sum is σ = 56311712. Its totient is φ = 28155852.

The previous prime is 42233771. The next prime is 42233791. The reversal of 42233781 is 18733224.

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 an interprime number because it is at equal distance from previous prime (42233771) and next prime (42233791).

It is not a de Polignac number, because 42233781 - 2¹¹ = 42231733 is a prime.

It is a super-2 number, since 2×42233781² = 3567384515111922, 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 (42233771) 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, 7038961 + ... + 7038966.

It is an arithmetic number, because the mean of its divisors is an integer number (14077928).

Almost surely, 2^42233781 is an apocalyptic number.

It is an amenable number.

42233781 is a deficient number, since it is larger than the sum of its proper divisors (14077931).

42233781 is a wasteful number, since it uses less digits than its factorization.

42233781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14077930.

The product of its digits is 8064, while the sum is 30.

The square root of 42233781 is about 6498.7522648582. The cubic root of 42233781 is about 348.2464151828.

The spelling of 42233781 in words is "forty-two million, two hundred thirty-three thousand, seven hundred eighty-one".