3991453 has 4 divisors (see below), whose sum is σ = 4032700. Its totient is φ = 3950208.

The previous prime is 3991451. The next prime is 3991469. The reversal of 3991453 is 3541993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1026169 + 2965284 = 1013^2 + 1722^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991453 - 2¹ = 3991451 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 (3991451) 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, 20478 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (1008175).

Almost surely, 2^3991453 is an apocalyptic number.

It is an amenable number.

3991453 is a deficient number, since it is larger than the sum of its proper divisors (41247).

3991453 is an equidigital number, since it uses as much as digits as its factorization.

3991453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41246.

The product of its digits is 14580, while the sum is 34.

The square root of 3991453 is about 1997.8621073538. The cubic root of 3991453 is about 158.6269619323.

It can be divided in two parts, 3991 and 453, that added together give a palindrome (4444).

The spelling of 3991453 in words is "three million, nine hundred ninety-one thousand, four hundred fifty-three".