1918866416 has 20 divisors (see below), whose sum is σ = 3756134592. Its totient is φ = 949541376.

The previous prime is 1918866407. The next prime is 1918866421. The reversal of 1918866416 is 6146688191.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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, 616640 + ... + 619743.

Almost surely, 2^1918866416 is an apocalyptic number.

1918866416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1918866416 is a deficient number, since it is larger than the sum of its proper divisors (1837268176).

1918866416 is a wasteful number, since it uses less digits than its factorization.

1918866416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236488 (or 1236482 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 1918866416 is about 43804.8674920950. The cubic root of 1918866416 is about 1242.6483494315.

The spelling of 1918866416 in words is "one billion, nine hundred eighteen million, eight hundred sixty-six thousand, four hundred sixteen".