1918377816 has 16 divisors (see below), whose sum is σ = 4795944600. Its totient is φ = 639459264.

The previous prime is 1918377809. The next prime is 1918377829. The reversal of 1918377816 is 6187738191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39966181 + ... + 39966228.

Almost surely, 2^1918377816 is an apocalyptic number.

It is an amenable number.

1918377816 is an abundant number, since it is smaller than the sum of its proper divisors (2877566784).

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

1918377816 is a wasteful number, since it uses less digits than its factorization.

1918377816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79932418 (or 79932414 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 1918377816 is about 43799.2901312339. The cubic root of 1918377816 is about 1242.5428688347.

The spelling of 1918377816 in words is "one billion, nine hundred eighteen million, three hundred seventy-seven thousand, eight hundred sixteen".