1909139 has 8 divisors (see below), whose sum is σ = 2034000. Its totient is φ = 1786752.

The previous prime is 1909129. The next prime is 1909147. The reversal of 1909139 is 9319091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1909139 - 2⁸ = 1908883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (254250).

2^1909139 is an apocalyptic number.

1909139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1909139 is a deficient number, since it is larger than the sum of its proper divisors (124861).

1909139 is a wasteful number, since it uses less digits than its factorization.

1909139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1909139 is about 1381.7159621283. The cubic root of 1909139 is about 124.0544982435.

It can be divided in two parts, 1909 and 139, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1909139 in words is "one million, nine hundred nine thousand, one hundred thirty-nine".