1930905 has 16 divisors (see below), whose sum is σ = 3432960. Its totient is φ = 1029744.

The previous prime is 1930883. The next prime is 1930927. The reversal of 1930905 is 5090391.

It is an interprime number because it is at equal distance from previous prime (1930883) and next prime (1930927).

It is not a de Polignac number, because 1930905 - 2¹⁹ = 1406617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7017 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (214560).

2^1930905 is an apocalyptic number.

1930905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1930905 is a deficient number, since it is larger than the sum of its proper divisors (1502055).

1930905 is a wasteful number, since it uses less digits than its factorization.

1930905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14317 (or 14311 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 1930905 is about 1389.5700773980. The cubic root of 1930905 is about 124.5241642747.

The spelling of 1930905 in words is "one million, nine hundred thirty thousand, nine hundred five".