1281958964 has 36 divisors (see below), whose sum is σ = 2650132800. Its totient is φ = 537881760.

The previous prime is 1281958961. The next prime is 1281958973. The reversal of 1281958964 is 4698591821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281958961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78764 + ... + 93635.

It is an arithmetic number, because the mean of its divisors is an integer number (73614800).

Almost surely, 2^1281958964 is an apocalyptic number.

It is an amenable number.

1281958964 is an abundant number, since it is smaller than the sum of its proper divisors (1368173836).

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

1281958964 is a wasteful number, since it uses less digits than its factorization.

1281958964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172440 (or 172425 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 53.

The square root of 1281958964 is about 35804.4545273350. The cubic root of 1281958964 is about 1086.3206649731.

The spelling of 1281958964 in words is "one billion, two hundred eighty-one million, nine hundred fifty-eight thousand, nine hundred sixty-four".