1909138 has 48 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 711480.

The previous prime is 1909129. The next prime is 1909147. The reversal of 1909138 is 8319091.

It is an interprime number because it is at equal distance from previous prime (1909129) and next prime (1909147).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82995 + ... + 83017.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2^1909138 is an apocalyptic number.

1909138 is an abundant number, since it is smaller than the sum of its proper divisors (1921262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1909138 is a wasteful number, since it uses less digits than its factorization.

1909138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1909138 is about 1381.7156002593. The cubic root of 1909138 is about 124.0544765837.

The spelling of 1909138 in words is "one million, nine hundred nine thousand, one hundred thirty-eight".