42090181 has 8 divisors (see below), whose sum is σ = 50932800. Its totient is φ = 33955008.

The previous prime is 42090131. The next prime is 42090197. The reversal of 42090181 is 18109024.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42090181 - 2¹¹ = 42088133 is a prime.

It is a super-2 number, since 2×42090181² = 3543166673225522, 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 (42090101) 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, 176731 + ... + 176968.

It is an arithmetic number, because the mean of its divisors is an integer number (6366600).

Almost surely, 2^42090181 is an apocalyptic number.

It is an amenable number.

42090181 is a deficient number, since it is larger than the sum of its proper divisors (8842619).

42090181 is a wasteful number, since it uses less digits than its factorization.

42090181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353723.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 42090181 is about 6487.6945828237. The cubic root of 42090181 is about 347.8512735899.

It can be divided in two parts, 420 and 90181, that added together give a square (90601 = 301²).

The spelling of 42090181 in words is "forty-two million, ninety thousand, one hundred eighty-one".