1897939 has 2 divisors, whose sum is σ = 1897940. Its totient is φ = 1897938.

The previous prime is 1897871. The next prime is 1897943. The reversal of 1897939 is 9397981.

It is a strong prime.

It is an emirp because it is prime and its reverse (9397981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1897939 - 2¹³ = 1889747 is a prime.

It is a Chen prime.

1897939 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1897949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948969 + 948970.

It is an arithmetic number, because the mean of its divisors is an integer number (948970).

2^1897939 is an apocalyptic number.

1897939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897939 is an equidigital number, since it uses as much as digits as its factorization.

1897939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1897939 is about 1377.6570690850. The cubic root of 1897939 is about 123.8114329540.

It can be divided in two parts, 189 and 7939, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 1897939 in words is "one million, eight hundred ninety-seven thousand, nine hundred thirty-nine".