42783381 has 24 divisors (see below), whose sum is σ = 66718080. Its totient is φ = 26337696.

The previous prime is 42783361. The next prime is 42783401. The reversal of 42783381 is 18338724.

42783381 is a `hidden beast` number, since 4 + 278 + 3 + 381 = 666.

It is an interprime number because it is at equal distance from previous prime (42783361) and next prime (42783401).

It is not a de Polignac number, because 42783381 - 2⁷ = 42783253 is a prime.

It is a super-2 number, since 2×42783381² = 3660835379582322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42783311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2440 + ... + 9566.

It is an arithmetic number, because the mean of its divisors is an integer number (2779920).

Almost surely, 2^42783381 is an apocalyptic number.

It is an amenable number.

42783381 is a deficient number, since it is larger than the sum of its proper divisors (23934699).

42783381 is a wasteful number, since it uses less digits than its factorization.

42783381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185 (or 7182 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 42783381 is about 6540.9006260606. The cubic root of 42783381 is about 349.7505188099.

The spelling of 42783381 in words is "forty-two million, seven hundred eighty-three thousand, three hundred eighty-one".