3961642 has 4 divisors (see below), whose sum is σ = 5942466. Its totient is φ = 1980820.

The previous prime is 3961631. The next prime is 3961649. The reversal of 3961642 is 2461693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2461693 = 13 ⋅189361.

It can be written as a sum of positive squares in only one way, i.e., 3876961 + 84681 = 1969^2 + 291^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3961649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990409 + ... + 990412.

Almost surely, 2^3961642 is an apocalyptic number.

3961642 is a deficient number, since it is larger than the sum of its proper divisors (1980824).

3961642 is a wasteful number, since it uses less digits than its factorization.

3961642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980823.

The product of its digits is 7776, while the sum is 31.

The square root of 3961642 is about 1990.3873994778. The cubic root of 3961642 is about 158.2310618092.

The spelling of 3961642 in words is "three million, nine hundred sixty-one thousand, six hundred forty-two".