3991455 has 24 divisors (see below), whose sum is σ = 7451808. Its totient is φ = 1964736.

The previous prime is 3991451. The next prime is 3991469. The reversal of 3991455 is 5541993.

It is not a de Polignac number, because 3991455 - 2² = 3991451 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2827 + ... + 3996.

It is an arithmetic number, because the mean of its divisors is an integer number (310492).

Almost surely, 2^3991455 is an apocalyptic number.

3991455 is a deficient number, since it is larger than the sum of its proper divisors (3460353).

3991455 is a wasteful number, since it uses less digits than its factorization.

3991455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847 (or 6844 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 3991455 is about 1997.8626078887. The cubic root of 3991455 is about 158.6269884267.

The spelling of 3991455 in words is "three million, nine hundred ninety-one thousand, four hundred fifty-five".