1625993 has 2 divisors, whose sum is σ = 1625994. Its totient is φ = 1625992.

The previous prime is 1625989. The next prime is 1626013. The reversal of 1625993 is 3995261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1281424 + 344569 = 1132^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625993 - 2² = 1625989 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1625903) 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 as a sum of consecutive naturals, namely, 812996 + 812997.

It is an arithmetic number, because the mean of its divisors is an integer number (812997).

2^1625993 is an apocalyptic number.

It is an amenable number.

1625993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625993 is an equidigital number, since it uses as much as digits as its factorization.

1625993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 1625993 is about 1275.1443055592. The cubic root of 1625993 is about 117.5906769492.

The spelling of 1625993 in words is "one million, six hundred twenty-five thousand, nine hundred ninety-three".