1955819 has 2 divisors, whose sum is σ = 1955820. Its totient is φ = 1955818.

The previous prime is 1955809. The next prime is 1955827. The reversal of 1955819 is 9185591.

It is a strong prime.

It is an emirp because it is prime and its reverse (9185591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1955819 - 2¹⁶ = 1890283 is a prime.

It is a super-2 number, since 2×1955819² = 7650455921522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1955809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977909 + 977910.

It is an arithmetic number, because the mean of its divisors is an integer number (977910).

2^1955819 is an apocalyptic number.

1955819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955819 is an equidigital number, since it uses as much as digits as its factorization.

1955819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 38.

The square root of 1955819 is about 1398.5059885463. The cubic root of 1955819 is about 125.0574455960.

The spelling of 1955819 in words is "one million, nine hundred fifty-five thousand, eight hundred nineteen".