11398640 has 40 divisors (see below), whose sum is σ = 28913328. Its totient is φ = 4144640.

The previous prime is 11398637. The next prime is 11398679. The reversal of 11398640 is 4689311.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 11398597 and 11398606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5597 + ... + 7356.

Almost surely, 2^11398640 is an apocalyptic number.

11398640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11398640 is an abundant number, since it is smaller than the sum of its proper divisors (17514688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11398640 is a wasteful number, since it uses less digits than its factorization.

11398640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12977 (or 12971 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 11398640 is about 3376.1871986014. The cubic root of 11398640 is about 225.0527612893.

It can be divided in two parts, 1139 and 8640, that added together give a palindrome (9779).

The spelling of 11398640 in words is "eleven million, three hundred ninety-eight thousand, six hundred forty".