4128691 has 8 divisors (see below), whose sum is σ = 4815200. Its totient is φ = 3538584.

The previous prime is 4128689. The next prime is 4128697. The reversal of 4128691 is 1968214.

It is a happy number.

It is not a de Polignac number, because 4128691 - 2¹ = 4128689 is a prime.

It is a Duffinian number.

4128691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4128697) 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, 5676 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (601900).

Almost surely, 2^4128691 is an apocalyptic number.

4128691 is a deficient number, since it is larger than the sum of its proper divisors (686509).

4128691 is an equidigital number, since it uses as much as digits as its factorization.

4128691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12058 (or 12044 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 4128691 is about 2031.9180593715. The cubic root of 4128691 is about 160.4245366203.

The spelling of 4128691 in words is "four million, one hundred twenty-eight thousand, six hundred ninety-one".