11401999 has 4 divisors (see below), whose sum is σ = 13030864. Its totient is φ = 9773136.

The previous prime is 11401987. The next prime is 11402003. The reversal of 11401999 is 99910411.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11401999 - 2⁹ = 11401487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11401909) 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, 814422 + ... + 814435.

It is an arithmetic number, because the mean of its divisors is an integer number (3257716).

Almost surely, 2^11401999 is an apocalyptic number.

11401999 is a deficient number, since it is larger than the sum of its proper divisors (1628865).

11401999 is an equidigital number, since it uses as much as digits as its factorization.

11401999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628864.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 11401999 is about 3376.6846166025. The cubic root of 11401999 is about 225.0748656217.

The spelling of 11401999 in words is "eleven million, four hundred one thousand, nine hundred ninety-nine".