1218690416 has 20 divisors (see below), whose sum is σ = 2365743672. Its totient is φ = 608175936.

The previous prime is 1218690367. The next prime is 1218690433. The reversal of 1218690416 is 6140968121.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1218690416.

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, 64451 + ... + 81186.

Almost surely, 2^1218690416 is an apocalyptic number.

1218690416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218690416 is a deficient number, since it is larger than the sum of its proper divisors (1147053256).

1218690416 is a wasteful number, since it uses less digits than its factorization.

1218690416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146168 (or 146162 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1218690416 is about 34909.7467192187. The cubic root of 1218690416 is about 1068.1472628181.

The spelling of 1218690416 in words is "one billion, two hundred eighteen million, six hundred ninety thousand, four hundred sixteen".