1918874139 has 16 divisors (see below), whose sum is σ = 3148922112. Its totient is φ = 1012153248.

The previous prime is 1918874081. The next prime is 1918874141. The reversal of 1918874139 is 9314788191.

It is a happy number.

It is not a de Polignac number, because 1918874139 - 2¹¹ = 1918872091 is a prime.

It is a super-2 number, since 2×1918874139² = 7364155922645982642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1918874091 and 1918874100.

It is not an unprimeable number, because it can be changed into a prime (1918874149) 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, 3514149 + ... + 3514694.

It is an arithmetic number, because the mean of its divisors is an integer number (196807632).

Almost surely, 2^1918874139 is an apocalyptic number.

1918874139 is a deficient number, since it is larger than the sum of its proper divisors (1230047973).

1918874139 is a wasteful number, since it uses less digits than its factorization.

1918874139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028866.

The product of its digits is 435456, while the sum is 51.

The square root of 1918874139 is about 43804.9556443104. The cubic root of 1918874139 is about 1242.6500165547.

The spelling of 1918874139 in words is "one billion, nine hundred eighteen million, eight hundred seventy-four thousand, one hundred thirty-nine".