42161290 has 8 divisors (see below), whose sum is σ = 75890340. Its totient is φ = 16864512.

The previous prime is 42161281. The next prime is 42161293. The reversal of 42161290 is 9216124.

It can be written as a sum of positive squares in 2 ways, for example, as 41460721 + 700569 = 6439^2 + 837^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42161293) 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, 2108055 + ... + 2108074.

Almost surely, 2^42161290 is an apocalyptic number.

42161290 is a deficient number, since it is larger than the sum of its proper divisors (33729050).

42161290 is a wasteful number, since it uses less digits than its factorization.

42161290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216136.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 42161290 is about 6493.1725681673. The cubic root of 42161290 is about 348.0470551160.

The spelling of 42161290 in words is "forty-two million, one hundred sixty-one thousand, two hundred ninety".