1216267404 has 96 divisors (see below), whose sum is σ = 3205585152. Its totient is φ = 355680000.

The previous prime is 1216267391. The next prime is 1216267411. The reversal of 1216267404 is 4047626121.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 638854 + ... + 640754.

It is an arithmetic number, because the mean of its divisors is an integer number (33391512).

Almost surely, 2^1216267404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216267404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1602792576).

1216267404 is an abundant number, since it is smaller than the sum of its proper divisors (1989317748).

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

1216267404 is a wasteful number, since it uses less digits than its factorization.

1216267404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087 (or 2085 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1216267404 is about 34875.0255053670. The cubic root of 1216267404 is about 1067.4388929293.

The spelling of 1216267404 in words is "one billion, two hundred sixteen million, two hundred sixty-seven thousand, four hundred four".