3961145 has 4 divisors (see below), whose sum is σ = 4753380. Its totient is φ = 3168912.

The previous prime is 3961121. The next prime is 3961147. The reversal of 3961145 is 5411693.

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 937024 + 3024121 = 968^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961145 - 2⁸ = 3960889 is a prime.

It is a super-2 number, since 2×3961145² = 31381339422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3961147) 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, 396110 + ... + 396119.

It is an arithmetic number, because the mean of its divisors is an integer number (1188345).

Almost surely, 2^3961145 is an apocalyptic number.

It is an amenable number.

3961145 is a deficient number, since it is larger than the sum of its proper divisors (792235).

3961145 is an equidigital number, since it uses as much as digits as its factorization.

3961145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792234.

The product of its digits is 3240, while the sum is 29.

The square root of 3961145 is about 1990.2625454949. The cubic root of 3961145 is about 158.2244446770.

The spelling of 3961145 in words is "three million, nine hundred sixty-one thousand, one hundred forty-five".