1939901 has 2 divisors, whose sum is σ = 1939902. Its totient is φ = 1939900.

The previous prime is 1939891. The next prime is 1939909. The reversal of 1939901 is 1099391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 63001 = 1370^2 + 251^2 .

It is an emirp because it is prime and its reverse (1099391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1939901 - 2⁶ = 1939837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1939909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969950 + 969951.

It is an arithmetic number, because the mean of its divisors is an integer number (969951).

2^1939901 is an apocalyptic number.

It is an amenable number.

1939901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939901 is an equidigital number, since it uses as much as digits as its factorization.

1939901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1939901 is about 1392.8032883362. The cubic root of 1939901 is about 124.7172488968.

The spelling of 1939901 in words is "one million, nine hundred thirty-nine thousand, nine hundred one".