1216038894 has 32 divisors (see below), whose sum is σ = 2780580096. Its totient is φ = 347306880.

The previous prime is 1216038881. The next prime is 1216038899. The reversal of 1216038894 is 4988306121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216038899) 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, 174709 + ... + 181535.

It is an arithmetic number, because the mean of its divisors is an integer number (86893128).

Almost surely, 2^1216038894 is an apocalyptic number.

1216038894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1216038894 is an abundant number, since it is smaller than the sum of its proper divisors (1564541202).

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

1216038894 is a wasteful number, since it uses less digits than its factorization.

1216038894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11080.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1216038894 is about 34871.7492248381. The cubic root of 1216038894 is about 1067.3720392812.

The spelling of 1216038894 in words is "one billion, two hundred sixteen million, thirty-eight thousand, eight hundred ninety-four".