3900145 has 4 divisors (see below), whose sum is σ = 4680180. Its totient is φ = 3120112.

The previous prime is 3900131. The next prime is 3900167. The reversal of 3900145 is 5410093.

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 1806336 + 2093809 = 1344^2 + 1447^2 .

It is a cyclic number.

It is not a de Polignac number, because 3900145 - 2¹⁹ = 3375857 is a prime.

It is a super-2 number, since 2×3900145² = 30422262042050, which contains 22 as substring.

3900145 is a lucky number.

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, 390010 + ... + 390019.

It is an arithmetic number, because the mean of its divisors is an integer number (1170045).

Almost surely, 2^3900145 is an apocalyptic number.

It is an amenable number.

3900145 is a deficient number, since it is larger than the sum of its proper divisors (780035).

3900145 is an equidigital number, since it uses as much as digits as its factorization.

3900145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780034.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 3900145 is about 1974.8784772740. The cubic root of 3900145 is about 157.4080423982.

The spelling of 3900145 in words is "three million, nine hundred thousand, one hundred forty-five".