1881481 has 4 divisors (see below), whose sum is σ = 2150272. Its totient is φ = 1612692.

The previous prime is 1881479. The next prime is 1881493. The reversal of 1881481 is 1841881.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1841881 = 127 ⋅14503.

It is a cyclic number.

It is not a de Polignac number, because 1881481 - 2¹ = 1881479 is a prime.

It is a super-2 number, since 2×1881481² = 7079941506722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134385 + ... + 134398.

It is an arithmetic number, because the mean of its divisors is an integer number (537568).

2^1881481 is an apocalyptic number.

It is an amenable number.

1881481 is a deficient number, since it is larger than the sum of its proper divisors (268791).

1881481 is an equidigital number, since it uses as much as digits as its factorization.

1881481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268790.

The product of its digits is 2048, while the sum is 31.

The square root of 1881481 is about 1371.6708788919. The cubic root of 1881481 is about 123.4525160710.

The spelling of 1881481 in words is "one million, eight hundred eighty-one thousand, four hundred eighty-one".