1909953 has 16 divisors (see below), whose sum is σ = 2856960. Its totient is φ = 1261008.

The previous prime is 1909951. The next prime is 1909981. The reversal of 1909953 is 3599091.

It is not a de Polignac number, because 1909953 - 2¹ = 1909951 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909951) 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, 3151 + ... + 3707.

It is an arithmetic number, because the mean of its divisors is an integer number (178560).

2^1909953 is an apocalyptic number.

It is an amenable number.

1909953 is a deficient number, since it is larger than the sum of its proper divisors (947007).

1909953 is a wasteful number, since it uses less digits than its factorization.

1909953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 1909953 is about 1382.0104920007. The cubic root of 1909953 is about 124.0721267859.

It can be divided in two parts, 190995 and 3, that multiplied together give a triangular number (572985 = T₁₀₇₀).

The spelling of 1909953 in words is "one million, nine hundred nine thousand, nine hundred fifty-three".