11899649 has 4 divisors (see below), whose sum is σ = 11906820. Its totient is φ = 11892480.

The previous prime is 11899637. The next prime is 11899661. The reversal of 11899649 is 94699811.

11899649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94699811 = 311 ⋅304501.

It is an interprime number because it is at equal distance from previous prime (11899637) and next prime (11899661).

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 7059649 = 2200^2 + 2657^2 .

It is a cyclic number.

It is not a de Polignac number, because 11899649 - 2¹⁶ = 11834113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11899049) 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, 329 + ... + 4889.

It is an arithmetic number, because the mean of its divisors is an integer number (2976705).

Almost surely, 2^11899649 is an apocalyptic number.

It is an amenable number.

11899649 is a deficient number, since it is larger than the sum of its proper divisors (7171).

11899649 is an equidigital number, since it uses as much as digits as its factorization.

11899649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170.

The product of its digits is 139968, while the sum is 47.

The square root of 11899649 is about 3449.5867868485. The cubic root of 11899649 is about 228.3028766926.

The spelling of 11899649 in words is "eleven million, eight hundred ninety-nine thousand, six hundred forty-nine".