3990551 has 8 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 3750840.

The previous prime is 3990541. The next prime is 3990593. The reversal of 3990551 is 1550993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3990551 - 2¹⁴ = 3974167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1886 + ... + 3396.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^3990551 is an apocalyptic number.

3990551 is a deficient number, since it is larger than the sum of its proper divisors (243049).

3990551 is a wasteful number, since it uses less digits than its factorization.

3990551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 3990551 is about 1997.6363532936. The cubic root of 3990551 is about 158.6150120401.

The spelling of 3990551 in words is "three million, nine hundred ninety thousand, five hundred fifty-one".