12401388 has 18 divisors (see below), whose sum is σ = 31348044. Its totient is φ = 4133784.

The previous prime is 12401369. The next prime is 12401399. The reversal of 12401388 is 88310421.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 172206 + ... + 172277.

It is an arithmetic number, because the mean of its divisors is an integer number (1741558).

Almost surely, 2^12401388 is an apocalyptic number.

12401388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12401388 is an abundant number, since it is smaller than the sum of its proper divisors (18946656).

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

12401388 is a wasteful number, since it uses less digits than its factorization.

12401388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344493 (or 344488 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 12401388 is about 3521.5604495735. The cubic root of 12401388 is about 231.4675412852.

It can be divided in two parts, 1240 and 1388, that added together give a triangular number (2628 = T₇₂).

The spelling of 12401388 in words is "twelve million, four hundred one thousand, three hundred eighty-eight".