11721698 has 4 divisors (see below), whose sum is σ = 17582550. Its totient is φ = 5860848.

The previous prime is 11721691. The next prime is 11721733. The reversal of 11721698 is 89612711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89612711 = 1039 ⋅86249.

It can be written as a sum of positive squares in only one way, i.e., 11377129 + 344569 = 3373^2 + 587^2 .

It is not an unprimeable number, because it can be changed into a prime (11721691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2930423 + ... + 2930426.

Almost surely, 2^11721698 is an apocalyptic number.

11721698 is a deficient number, since it is larger than the sum of its proper divisors (5860852).

11721698 is an equidigital number, since it uses as much as digits as its factorization.

11721698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5860851.

The product of its digits is 6048, while the sum is 35.

The square root of 11721698 is about 3423.6965402909. The cubic root of 11721698 is about 227.1591191613.

The spelling of 11721698 in words is "eleven million, seven hundred twenty-one thousand, six hundred ninety-eight".