1388820132 has 108 divisors (see below), whose sum is σ = 4261473216. Its totient is φ = 379542240.

The previous prime is 1388820127. The next prime is 1388820163. The reversal of 1388820132 is 2310288831.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23457 + ... + 57687.

Almost surely, 2^1388820132 is an apocalyptic number.

1388820132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388820132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130736608).

1388820132 is an abundant number, since it is smaller than the sum of its proper divisors (2872653084).

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

1388820132 is a wasteful number, since it uses less digits than its factorization.

1388820132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34278 (or 34266 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1388820132 is about 37266.8771431146. The cubic root of 1388820132 is about 1115.7031719157.

The spelling of 1388820132 in words is "one billion, three hundred eighty-eight million, eight hundred twenty thousand, one hundred thirty-two".