40451018 has 8 divisors (see below), whose sum is σ = 60942180. Its totient is φ = 20136960.

The previous prime is 40451017. The next prime is 40451023. The reversal of 40451018 is 81015404.

It can be written as a sum of positive squares in 2 ways, for example, as 30063289 + 10387729 = 5483^2 + 3223^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40450984 and 40451002.

It is not an unprimeable number, because it can be changed into a prime (40451017) 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, 43703 + ... + 44618.

Almost surely, 2^40451018 is an apocalyptic number.

40451018 is a deficient number, since it is larger than the sum of its proper divisors (20491162).

40451018 is a wasteful number, since it uses less digits than its factorization.

40451018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88552.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 40451018 is about 6360.1114770104. Note that the first 3 decimals coincide. The cubic root of 40451018 is about 343.2757715001.

The spelling of 40451018 in words is "forty million, four hundred fifty-one thousand, eighteen".