3969491 has 4 divisors (see below), whose sum is σ = 4106400. Its totient is φ = 3832584.

The previous prime is 3969487. The next prime is 3969503. The reversal of 3969491 is 1949693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1949693 = 463 ⋅4211.

It is a cyclic number.

It is not a de Polignac number, because 3969491 - 2² = 3969487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969421) 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, 68411 + ... + 68468.

It is an arithmetic number, because the mean of its divisors is an integer number (1026600).

Almost surely, 2^3969491 is an apocalyptic number.

3969491 is a deficient number, since it is larger than the sum of its proper divisors (136909).

3969491 is a wasteful number, since it uses less digits than its factorization.

3969491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136908.

The product of its digits is 52488, while the sum is 41.

The square root of 3969491 is about 1992.3581505342. The cubic root of 3969491 is about 158.3354912602.

The spelling of 3969491 in words is "three million, nine hundred sixty-nine thousand, four hundred ninety-one".