42389181 has 6 divisors (see below), whose sum is σ = 61228830. Its totient is φ = 28259448.

The previous prime is 42389153. The next prime is 42389219. The reversal of 42389181 is 18198324.

It can be written as a sum of positive squares in only one way, i.e., 40525956 + 1863225 = 6366^2 + 1365^2 .

It is not a de Polignac number, because 42389181 - 2¹¹ = 42387133 is a prime.

It is a super-2 number, since 2×42389181² = 3593685331701522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42389101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2354946 + ... + 2354963.

It is an arithmetic number, because the mean of its divisors is an integer number (10204805).

Almost surely, 2^42389181 is an apocalyptic number.

It is an amenable number.

42389181 is a deficient number, since it is larger than the sum of its proper divisors (18839649).

42389181 is a wasteful number, since it uses less digits than its factorization.

42389181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4709915 (or 4709912 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 42389181 is about 6510.6974280794. The cubic root of 42389181 is about 348.6730188126.

The spelling of 42389181 in words is "forty-two million, three hundred eighty-nine thousand, one hundred eighty-one".