1216386562 has 16 divisors (see below), whose sum is σ = 1832264640. Its totient is φ = 605637648.

The previous prime is 1216386557. The next prime is 1216386607. The reversal of 1216386562 is 2656836121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728853 + ... + 730519.

It is an arithmetic number, because the mean of its divisors is an integer number (114516540).

Almost surely, 2^1216386562 is an apocalyptic number.

1216386562 is a deficient number, since it is larger than the sum of its proper divisors (615878078).

1216386562 is a wasteful number, since it uses less digits than its factorization.

1216386562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985.

The product of its digits is 103680, while the sum is 40.

The square root of 1216386562 is about 34876.7338207006. The cubic root of 1216386562 is about 1067.4737508697.

The spelling of 1216386562 in words is "one billion, two hundred sixteen million, three hundred eighty-six thousand, five hundred sixty-two".