3945213 has 16 divisors (see below), whose sum is σ = 6099840. Its totient is φ = 2515392.

The previous prime is 3945203. The next prime is 3945233. The reversal of 3945213 is 3125493.

It is not a de Polignac number, because 3945213 - 2¹⁰ = 3944189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2556 + ... + 3797.

It is an arithmetic number, because the mean of its divisors is an integer number (381240).

Almost surely, 2^3945213 is an apocalyptic number.

It is an amenable number.

3945213 is a deficient number, since it is larger than the sum of its proper divisors (2154627).

3945213 is a wasteful number, since it uses less digits than its factorization.

3945213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385 (or 6379 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 3945213 is about 1986.2560257933. The cubic root of 3945213 is about 158.0120297415.

The spelling of 3945213 in words is "three million, nine hundred forty-five thousand, two hundred thirteen".