11998440 has 48 divisors (see below), whose sum is σ = 38996100. Its totient is φ = 3199488.

The previous prime is 11998439. The next prime is 11998487. The reversal of 11998440 is 4489911.

11998440 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11985444 + 12996 = 3462^2 + 114^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 11998395 and 11998404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16305 + ... + 17024.

Almost surely, 2^11998440 is an apocalyptic number.

11998440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11998440 is an abundant number, since it is smaller than the sum of its proper divisors (26997660).

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

11998440 is a wasteful number, since it uses less digits than its factorization.

11998440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33346 (or 33339 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 11998440 is about 3463.8764412144. The cubic root of 11998440 is about 228.9329272240.

The spelling of 11998440 in words is "eleven million, nine hundred ninety-eight thousand, four hundred forty".