40401818 has 8 divisors (see below), whose sum is σ = 61203060. Its totient is φ = 20000800.

The previous prime is 40401799. The next prime is 40401821. The reversal of 40401818 is 81810404.

It can be written as a sum of positive squares in 2 ways, for example, as 40360609 + 41209 = 6353^2 + 203^2 .

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

40401818 is a modest number, since divided by 1818 gives 404 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99803 + ... + 100206.

Almost surely, 2^40401818 is an apocalyptic number.

40401818 is a deficient number, since it is larger than the sum of its proper divisors (20801242).

40401818 is a wasteful number, since it uses less digits than its factorization.

40401818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200112.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 40401818 is about 6356.2424434567. The cubic root of 40401818 is about 343.1365412181.

The spelling of 40401818 in words is "forty million, four hundred one thousand, eight hundred eighteen".