42181002 has 12 divisors (see below), whose sum is σ = 91392210. Its totient is φ = 14060328.

The previous prime is 42181001. The next prime is 42181019. The reversal of 42181002 is 20018124.

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 4247721 = 6159^2 + 2061^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2343389 = 42181002 / (4 + 2 + 1 + 8 + 1 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (42181001) 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, 1171677 + ... + 1171712.

Almost surely, 2^42181002 is an apocalyptic number.

42181002 is an abundant number, since it is smaller than the sum of its proper divisors (49211208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42181002 is a wasteful number, since it uses less digits than its factorization.

42181002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343397 (or 2343394 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 42181002 is about 6494.6902928469. The cubic root of 42181002 is about 348.1012883918.

Adding to 42181002 its reverse (20018124), we get a palindrome (62199126).

The spelling of 42181002 in words is "forty-two million, one hundred eighty-one thousand, two".