1911738138 has 16 divisors (see below), whose sum is σ = 3858555360. Its totient is φ = 631399536.

The previous prime is 1911738121. The next prime is 1911738139. The reversal of 1911738138 is 8318371191.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1911738138.

It is not an unprimeable number, because it can be changed into a prime (1911738139) 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, 1460920 + ... + 1462227.

It is an arithmetic number, because the mean of its divisors is an integer number (241159710).

Almost surely, 2^1911738138 is an apocalyptic number.

1911738138 is an abundant number, since it is smaller than the sum of its proper divisors (1946817222).

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

1911738138 is a wasteful number, since it uses less digits than its factorization.

1911738138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923261.

The product of its digits is 36288, while the sum is 42.

The square root of 1911738138 is about 43723.4277933467. The cubic root of 1911738138 is about 1241.1076942964.

The spelling of 1911738138 in words is "one billion, nine hundred eleven million, seven hundred thirty-eight thousand, one hundred thirty-eight".