3949145 has 4 divisors (see below), whose sum is σ = 4738980. Its totient is φ = 3159312.

The previous prime is 3949111. The next prime is 3949147. The reversal of 3949145 is 5419493.

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 737881 + 3211264 = 859^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949145 - 2¹⁰ = 3948121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3949147) 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, 394910 + ... + 394919.

It is an arithmetic number, because the mean of its divisors is an integer number (1184745).

Almost surely, 2^3949145 is an apocalyptic number.

It is an amenable number.

3949145 is a deficient number, since it is larger than the sum of its proper divisors (789835).

3949145 is an equidigital number, since it uses as much as digits as its factorization.

3949145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789834.

The product of its digits is 19440, while the sum is 35.

The square root of 3949145 is about 1987.2455812003. The cubic root of 3949145 is about 158.0645065878.

The spelling of 3949145 in words is "three million, nine hundred forty-nine thousand, one hundred forty-five".