1918987107 has 8 divisors (see below), whose sum is σ = 2559248976. Its totient is φ = 1279024992.

The previous prime is 1918987097. The next prime is 1918987121. The reversal of 1918987107 is 7017898191.

It is a happy number.

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

It is not a de Polignac number, because 1918987107 - 2¹⁴ = 1918970723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1918987107.

It is not an unprimeable number, because it can be changed into a prime (1918987207) 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, 59548 + ... + 85929.

It is an arithmetic number, because the mean of its divisors is an integer number (319906122).

Almost surely, 2^1918987107 is an apocalyptic number.

1918987107 is a deficient number, since it is larger than the sum of its proper divisors (640261869).

1918987107 is a wasteful number, since it uses less digits than its factorization.

1918987107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149877.

The product of its (nonzero) digits is 254016, while the sum is 51.

The square root of 1918987107 is about 43806.2450684831. The cubic root of 1918987107 is about 1242.6744018491.

The spelling of 1918987107 in words is "one billion, nine hundred eighteen million, nine hundred eighty-seven thousand, one hundred seven".