40002145 has 8 divisors (see below), whose sum is σ = 48252456. Its totient is φ = 31835136.

The previous prime is 40002133. The next prime is 40002191. The reversal of 40002145 is 54120004.

It can be written as a sum of positive squares in 4 ways, for example, as 160801 + 39841344 = 401^2 + 6312^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40002145 is a prime.

It is a Duffinian number.

40002145 is a modest number, since divided by 2145 gives 40 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19762 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (6031557).

Almost surely, 2^40002145 is an apocalyptic number.

It is an amenable number.

40002145 is a deficient number, since it is larger than the sum of its proper divisors (8250311).

40002145 is a wasteful number, since it uses less digits than its factorization.

40002145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41651.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40002145 is about 6324.7248952030. The cubic root of 40002145 is about 342.0013023901.

Adding to 40002145 its reverse (54120004), we get a palindrome (94122149).

The spelling of 40002145 in words is "forty million, two thousand, one hundred forty-five".