1909357138 has 16 divisors (see below), whose sum is σ = 3097261440. Its totient is φ = 877551696.

The previous prime is 1909357127. The next prime is 1909357141. The reversal of 1909357138 is 8317539091.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147420 + ... + 159847.

It is an arithmetic number, because the mean of its divisors is an integer number (193578840).

Almost surely, 2^1909357138 is an apocalyptic number.

1909357138 is a deficient number, since it is larger than the sum of its proper divisors (1187904302).

1909357138 is a wasteful number, since it uses less digits than its factorization.

1909357138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307521.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1909357138 is about 43696.1913443266. The cubic root of 1909357138 is about 1240.5922288107.

The spelling of 1909357138 in words is "one billion, nine hundred nine million, three hundred fifty-seven thousand, one hundred thirty-eight".