1213954578 has 12 divisors (see below), whose sum is σ = 2630234958. Its totient is φ = 404651520.

The previous prime is 1213954549. The next prime is 1213954579. The reversal of 1213954578 is 8754593121.

1213954578 is a `hidden beast` number, since 1 + 2 + 1 + 39 + 545 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1067132889 + 146821689 = 32667^2 + 12117^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213954579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33720943 + ... + 33720978.

Almost surely, 2^1213954578 is an apocalyptic number.

1213954578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1213954578 is an abundant number, since it is smaller than the sum of its proper divisors (1416280380).

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

1213954578 is a wasteful number, since it uses less digits than its factorization.

1213954578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67441929 (or 67441926 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 1213954578 is about 34841.8509554243. The cubic root of 1213954578 is about 1066.7618578893.

The spelling of 1213954578 in words is "one billion, two hundred thirteen million, nine hundred fifty-four thousand, five hundred seventy-eight".