1903145 has 4 divisors (see below), whose sum is σ = 2283780. Its totient is φ = 1522512.

The previous prime is 1903123. The next prime is 1903147. The reversal of 1903145 is 5413091.

1903145 = T₈₇₀ + T₈₇₁ + ... + T₈₇₄.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 760384 = 1069^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1903145 - 2⁶ = 1903081 is a prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1903145.

It is not an unprimeable number, because it can be changed into a prime (1903147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190310 + ... + 190319.

It is an arithmetic number, because the mean of its divisors is an integer number (570945).

2^1903145 is an apocalyptic number.

It is an amenable number.

1903145 is a deficient number, since it is larger than the sum of its proper divisors (380635).

1903145 is an equidigital number, since it uses as much as digits as its factorization.

1903145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380634.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1903145 is about 1379.5452149169. The cubic root of 1903145 is about 123.9245335115.

It can be divided in two parts, 1903 and 145, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1903145 in words is "one million, nine hundred three thousand, one hundred forty-five".