3969842 has 4 divisors (see below), whose sum is σ = 5954766. Its totient is φ = 1984920.

The previous prime is 3969827. The next prime is 3969853. The reversal of 3969842 is 2489693.

It is a happy number.

3969842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2489693 = 37 ⋅67289.

It can be written as a sum of positive squares in only one way, i.e., 3728761 + 241081 = 1931^2 + 491^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3969842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992459 + ... + 992462.

Almost surely, 2^3969842 is an apocalyptic number.

3969842 is a deficient number, since it is larger than the sum of its proper divisors (1984924).

3969842 is a wasteful number, since it uses less digits than its factorization.

3969842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984923.

The product of its digits is 93312, while the sum is 41.

The square root of 3969842 is about 1992.4462351592. The cubic root of 3969842 is about 158.3401580315.

The spelling of 3969842 in words is "three million, nine hundred sixty-nine thousand, eight hundred forty-two".