1981392 has 40 divisors (see below), whose sum is σ = 5850816. Its totient is φ = 566016.

The previous prime is 1981361. The next prime is 1981393. The reversal of 1981392 is 2931891.

It is a super-3 number, since 3×1981392³ = 23336325308464164864, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613 + ... + 3284.

2^1981392 is an apocalyptic number.

1981392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981392 is an abundant number, since it is smaller than the sum of its proper divisors (3869424).

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

1981392 is a wasteful number, since it uses less digits than its factorization.

1981392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5915 (or 5909 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 1981392 is about 1407.6192667053. The cubic root of 1981392 is about 125.6001433457.

The spelling of 1981392 in words is "one million, nine hundred eighty-one thousand, three hundred ninety-two".