4000145 has 4 divisors (see below), whose sum is σ = 4800180. Its totient is φ = 3200112.

The previous prime is 4000133. The next prime is 4000153. The reversal of 4000145 is 5410004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1201216 + 2798929 = 1096^2 + 1673^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000145 - 2⁶ = 4000081 is a prime.

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, 400010 + ... + 400019.

It is an arithmetic number, because the mean of its divisors is an integer number (1200045).

Almost surely, 2^4000145 is an apocalyptic number.

It is an amenable number.

4000145 is a deficient number, since it is larger than the sum of its proper divisors (800035).

4000145 is an equidigital number, since it uses as much as digits as its factorization.

4000145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800034.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4000145 is about 2000.0362496715. The cubic root of 4000145 is about 158.7420232832.

Adding to 4000145 its reverse (5410004), we get a palindrome (9410149).

The spelling of 4000145 in words is "four million, one hundred forty-five", and thus it is an aban number.