40181004 has 36 divisors (see below), whose sum is σ = 102322584. Its totient is φ = 13294272.

The previous prime is 40181003. The next prime is 40181017. The reversal of 40181004 is 40018104.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×40181004² = 3229026164896032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40181003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 859 + ... + 9005.

It is an arithmetic number, because the mean of its divisors is an integer number (2842294).

Almost surely, 2^40181004 is an apocalyptic number.

It is an amenable number.

40181004 is an abundant number, since it is smaller than the sum of its proper divisors (62141580).

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

40181004 is a wasteful number, since it uses less digits than its factorization.

40181004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294 (or 8289 counting only the distinct ones).

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

The square root of 40181004 is about 6338.8487913816. The cubic root of 40181004 is about 342.5102673321.

Adding to 40181004 its reverse (40018104), we get a palindrome (80199108).

It can be divided in two parts, 4018100 and 4, that added together give a palindrome (4018104).

The spelling of 40181004 in words is "forty million, one hundred eighty-one thousand, four".