1216354646 has 16 divisors (see below), whose sum is σ = 1978074000. Its totient is φ = 557624928.

The previous prime is 1216354639. The next prime is 1216354661. The reversal of 1216354646 is 6464536121.

It is a congruent number.

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, 153116 + ... + 160863.

It is an arithmetic number, because the mean of its divisors is an integer number (123629625).

Almost surely, 2^1216354646 is an apocalyptic number.

1216354646 is a deficient number, since it is larger than the sum of its proper divisors (761719354).

1216354646 is a wasteful number, since it uses less digits than its factorization.

1216354646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314143.

The product of its digits is 103680, while the sum is 38.

The square root of 1216354646 is about 34876.2762633857. The cubic root of 1216354646 is about 1067.4644145311.

The spelling of 1216354646 in words is "one billion, two hundred sixteen million, three hundred fifty-four thousand, six hundred forty-six".