3945305 has 48 divisors (see below), whose sum is σ = 6324480. Its totient is φ = 2306304.

The previous prime is 3945301. The next prime is 3945313. The reversal of 3945305 is 5035493.

3945305 = T₁₂₆ + T₁₂₇ + ... + T₂₉₄.

It is not a de Polignac number, because 3945305 - 2² = 3945301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3945301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 136031 + ... + 136059.

It is an arithmetic number, because the mean of its divisors is an integer number (131760).

Almost surely, 2^3945305 is an apocalyptic number.

3945305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3945305 is a deficient number, since it is larger than the sum of its proper divisors (2379175).

3945305 is a wasteful number, since it uses less digits than its factorization.

3945305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 3945305 is about 1986.2791848076. The cubic root of 3945305 is about 158.0132579806.

The spelling of 3945305 in words is "three million, nine hundred forty-five thousand, three hundred five".