1243964478 has 16 divisors (see below), whose sum is σ = 2525063040. Its totient is φ = 408465816.

The previous prime is 1243964459. The next prime is 1243964479. The reversal of 1243964478 is 8744693421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243964479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546818 + ... + 1547621.

It is an arithmetic number, because the mean of its divisors is an integer number (157816440).

Almost surely, 2^1243964478 is an apocalyptic number.

1243964478 is an abundant number, since it is smaller than the sum of its proper divisors (1281098562).

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

1243964478 is a wasteful number, since it uses less digits than its factorization.

1243964478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094511.

The product of its digits is 1161216, while the sum is 48.

The square root of 1243964478 is about 35269.8806065459. The cubic root of 1243964478 is about 1075.4807953516.

The spelling of 1243964478 in words is "one billion, two hundred forty-three million, nine hundred sixty-four thousand, four hundred seventy-eight".