1626881 has 2 divisors, whose sum is σ = 1626882. Its totient is φ = 1626880.

The previous prime is 1626829. The next prime is 1626887. The reversal of 1626881 is 1886261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 148225 = 1216^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626881 - 2⁶ = 1626817 is a prime.

It is a super-2 number, since 2×1626881² = 5293483576322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1626887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813440 + 813441.

It is an arithmetic number, because the mean of its divisors is an integer number (813441).

2^1626881 is an apocalyptic number.

It is an amenable number.

1626881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626881 is an equidigital number, since it uses as much as digits as its factorization.

1626881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 1626881 is about 1275.4924539173. The cubic root of 1626881 is about 117.6120795666.

The spelling of 1626881 in words is "one million, six hundred twenty-six thousand, eight hundred eighty-one".