1798919 has 2 divisors, whose sum is σ = 1798920. Its totient is φ = 1798918.

The previous prime is 1798913. The next prime is 1798921. The reversal of 1798919 is 9198971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1798919 - 2¹² = 1794823 is a prime.

It is a super-2 number, since 2×1798919² = 6472219137122, which contains 22 as substring.

Together with 1798921, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1798919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899459 + 899460.

It is an arithmetic number, because the mean of its divisors is an integer number (899460).

2^1798919 is an apocalyptic number.

1798919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798919 is an equidigital number, since it uses as much as digits as its factorization.

1798919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 44.

The square root of 1798919 is about 1341.2378610821. The cubic root of 1798919 is about 121.6196837004.

The spelling of 1798919 in words is "one million, seven hundred ninety-eight thousand, nine hundred nineteen".