4005145 has 8 divisors (see below), whose sum is σ = 4872456. Its totient is φ = 3159936.

The previous prime is 4005137. The next prime is 4005173. The reversal of 4005145 is 5415004.

4005145 = T₇₁ + T₇₂ + ... + T₂₈₉.

It can be written as a sum of positive squares in 4 ways, for example, as 571536 + 3433609 = 756^2 + 1853^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4005145 - 2³ = 4005137 is a prime.

It is a super-3 number, since 3×4005145³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

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, 5122 + ... + 5851.

It is an arithmetic number, because the mean of its divisors is an integer number (609057).

Almost surely, 2^4005145 is an apocalyptic number.

It is an amenable number.

4005145 is a deficient number, since it is larger than the sum of its proper divisors (867311).

4005145 is a wasteful number, since it uses less digits than its factorization.

4005145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11051.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 4005145 is about 2001.2858366560. The cubic root of 4005145 is about 158.8081358571.

The spelling of 4005145 in words is "four million, five thousand, one hundred forty-five".