1981627 has 2 divisors, whose sum is σ = 1981628. Its totient is φ = 1981626.

The previous prime is 1981621. The next prime is 1981631. The reversal of 1981627 is 7261891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1981627 - 2³ = 1981619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1981592 and 1981601.

It is not a weakly prime, because it can be changed into another prime (1981621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990813 + 990814.

It is an arithmetic number, because the mean of its divisors is an integer number (990814).

2^1981627 is an apocalyptic number.

1981627 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981627 is an equidigital number, since it uses as much as digits as its factorization.

1981627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 1981627 is about 1407.7027385070. The cubic root of 1981627 is about 125.6051086878.

The spelling of 1981627 in words is "one million, nine hundred eighty-one thousand, six hundred twenty-seven".