1381881 has 4 divisors (see below), whose sum is σ = 1842512. Its totient is φ = 921252.

The previous prime is 1381871. The next prime is 1381883. The reversal of 1381881 is 1881831.

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 not a de Polignac number, because 1381881 - 2¹³ = 1373689 is a prime.

It is a super-2 number, since 2×1381881² = 3819190196322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1381883) 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, 230311 + ... + 230316.

It is an arithmetic number, because the mean of its divisors is an integer number (460628).

2^1381881 is an apocalyptic number.

It is an amenable number.

1381881 is a deficient number, since it is larger than the sum of its proper divisors (460631).

1381881 is an equidigital number, since it uses as much as digits as its factorization.

1381881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460630.

The product of its digits is 1536, while the sum is 30.

The square root of 1381881 is about 1175.5343465846. The cubic root of 1381881 is about 111.3841893786.

The spelling of 1381881 in words is "one million, three hundred eighty-one thousand, eight hundred eighty-one".