1916939 has 2 divisors, whose sum is σ = 1916940. Its totient is φ = 1916938.

The previous prime is 1916921. The next prime is 1916951. The reversal of 1916939 is 9396191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1916939 - 2¹² = 1912843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1916909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958469 + 958470.

It is an arithmetic number, because the mean of its divisors is an integer number (958470).

2^1916939 is an apocalyptic number.

1916939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916939 is an equidigital number, since it uses as much as digits as its factorization.

1916939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 38.

The square root of 1916939 is about 1384.5356622348. The cubic root of 1916939 is about 124.2232148376.

The spelling of 1916939 in words is "one million, nine hundred sixteen thousand, nine hundred thirty-nine".