1939657 has 2 divisors, whose sum is σ = 1939658. Its totient is φ = 1939656.

The previous prime is 1939633. The next prime is 1939673. The reversal of 1939657 is 7569391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 141376 = 1341^2 + 376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1939657 - 2¹⁵ = 1906889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939057) 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, 969828 + 969829.

It is an arithmetic number, because the mean of its divisors is an integer number (969829).

2^1939657 is an apocalyptic number.

It is an amenable number.

1939657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939657 is an equidigital number, since it uses as much as digits as its factorization.

1939657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The square root of 1939657 is about 1392.7156924513. The cubic root of 1939657 is about 124.7120197150.

The spelling of 1939657 in words is "one million, nine hundred thirty-nine thousand, six hundred fifty-seven".