1886981 has 2 divisors, whose sum is σ = 1886982. Its totient is φ = 1886980.

The previous prime is 1886957. The next prime is 1886993. The reversal of 1886981 is 1896881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 21025 = 1366^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1886981 - 2⁶ = 1886917 is a prime.

It is a super-2 number, since 2×1886981² = 7121394588722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1886081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943490 + 943491.

It is an arithmetic number, because the mean of its divisors is an integer number (943491).

2^1886981 is an apocalyptic number.

It is an amenable number.

1886981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1886981 is an equidigital number, since it uses as much as digits as its factorization.

1886981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 41.

The square root of 1886981 is about 1373.6742699781. The cubic root of 1886981 is about 123.5726923749.

The spelling of 1886981 in words is "one million, eight hundred eighty-six thousand, nine hundred eighty-one".