11401988 has 24 divisors (see below), whose sum is σ = 22232280. Its totient is φ = 5080320.

The previous prime is 11401987. The next prime is 11402003. The reversal of 11401988 is 88910411.

It can be written as a sum of positive squares in 4 ways, for example, as 58564 + 11343424 = 242^2 + 3368^2 .

It is not an unprimeable number, because it can be changed into a prime (11401981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273 + ... + 5288.

It is an arithmetic number, because the mean of its divisors is an integer number (926345).

Almost surely, 2^11401988 is an apocalyptic number.

It is an amenable number.

11401988 is a deficient number, since it is larger than the sum of its proper divisors (10830292).

11401988 is a wasteful number, since it uses less digits than its factorization.

11401988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7605 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 11401988 is about 3376.6829877855. The cubic root of 11401988 is about 225.0747932419.

The spelling of 11401988 in words is "eleven million, four hundred one thousand, nine hundred eighty-eight".