3967551 has 24 divisors (see below), whose sum is σ = 6649344. Its totient is φ = 2232720.

The previous prime is 3967541. The next prime is 3967553. The reversal of 3967551 is 1557693.

It is a happy number.

It is not a de Polignac number, because 3967551 - 2⁶ = 3967487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3967553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4030 + ... + 4916.

It is an arithmetic number, because the mean of its divisors is an integer number (277056).

Almost surely, 2^3967551 is an apocalyptic number.

3967551 is a deficient number, since it is larger than the sum of its proper divisors (2681793).

3967551 is a wasteful number, since it uses less digits than its factorization.

3967551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971 (or 968 counting only the distinct ones).

The product of its digits is 28350, while the sum is 36.

The square root of 3967551 is about 1991.8712307777. The cubic root of 3967551 is about 158.3096927462.

The spelling of 3967551 in words is "three million, nine hundred sixty-seven thousand, five hundred fifty-one".