1261964424 has 48 divisors (see below), whose sum is σ = 3670002000. Its totient is φ = 360560928.

The previous prime is 1261964413. The next prime is 1261964449. The reversal of 1261964424 is 4244691621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 535374 + ... + 537725.

It is an arithmetic number, because the mean of its divisors is an integer number (76458375).

Almost surely, 2^1261964424 is an apocalyptic number.

1261964424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1261964424 is an abundant number, since it is smaller than the sum of its proper divisors (2408037576).

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

1261964424 is a wasteful number, since it uses less digits than its factorization.

1261964424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073122 (or 1073111 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 1261964424 is about 35524.1386102464. The cubic root of 1261964424 is about 1080.6433135723.

The spelling of 1261964424 in words is "one billion, two hundred sixty-one million, nine hundred sixty-four thousand, four hundred twenty-four".