1431388 has 36 divisors (see below), whose sum is σ = 2984520. Its totient is φ = 598752.

The previous prime is 1431379. The next prime is 1431389. The reversal of 1431388 is 8831341.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431389) 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 11 ways as a sum of consecutive naturals, for example, 13078 + ... + 13186.

2^1431388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1431388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492260).

1431388 is an abundant number, since it is smaller than the sum of its proper divisors (1553132).

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

1431388 is a wasteful number, since it uses less digits than its factorization.

1431388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 185 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 1431388 is about 1196.4062855067. The cubic root of 1431388 is about 112.6987564643.

The spelling of 1431388 in words is "one million, four hundred thirty-one thousand, three hundred eighty-eight".