1888381 has 4 divisors (see below), whose sum is σ = 2060064. Its totient is φ = 1716700.

The previous prime is 1888361. The next prime is 1888399. The reversal of 1888381 is 1838881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1888381 - 2⁵ = 1888349 is a prime.

It is a super-2 number, since 2×1888381² = 7131965602322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1888381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1888301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85825 + ... + 85846.

It is an arithmetic number, because the mean of its divisors is an integer number (515016).

2^1888381 is an apocalyptic number.

1888381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1888381 is a deficient number, since it is larger than the sum of its proper divisors (171683).

1888381 is a wasteful number, since it uses less digits than its factorization.

1888381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171682.

The product of its digits is 12288, while the sum is 37.

The square root of 1888381 is about 1374.1837577267. The cubic root of 1888381 is about 123.6032454121.

The spelling of 1888381 in words is "one million, eight hundred eighty-eight thousand, three hundred eighty-one".