1900005 has 16 divisors (see below), whose sum is σ = 3219264. Its totient is φ = 953600.

The previous prime is 1899983. The next prime is 1900009. The reversal of 1900005 is 5000091.

It is not a de Polignac number, because 1900005 - 2¹¹ = 1897957 is a prime.

It is a super-2 number, since 2×1900005² = 7220038000050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3471 + ... + 3980.

It is an arithmetic number, because the mean of its divisors is an integer number (201204).

2^1900005 is an apocalyptic number.

1900005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1900005 is a deficient number, since it is larger than the sum of its proper divisors (1319259).

1900005 is a wasteful number, since it uses less digits than its factorization.

1900005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7476.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 1900005 is about 1378.4066888985. The cubic root of 1900005 is about 123.8563416087.

Adding to 1900005 its reverse (5000091), we get a palindrome (6900096).

The spelling of 1900005 in words is "one million, nine hundred thousand, five".