42730381 has 4 divisors (see below), whose sum is σ = 42889500. Its totient is φ = 42571264.

The previous prime is 42730357. The next prime is 42730403. The reversal of 42730381 is 18303724.

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 1334025 + 41396356 = 1155^2 + 6434^2 .

It is a cyclic number.

It is not a de Polignac number, because 42730381 - 2¹¹ = 42728333 is a prime.

It is a super-2 number, since 2×42730381² = 3651770920810322, 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 (42730321) 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, 79156 + ... + 79693.

It is an arithmetic number, because the mean of its divisors is an integer number (10722375).

Almost surely, 2^42730381 is an apocalyptic number.

It is an amenable number.

42730381 is a deficient number, since it is larger than the sum of its proper divisors (159119).

42730381 is a wasteful number, since it uses less digits than its factorization.

42730381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159118.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 42730381 is about 6536.8479407127. The cubic root of 42730381 is about 349.6060356267.

The spelling of 42730381 in words is "forty-two million, seven hundred thirty thousand, three hundred eighty-one".