1261385632 has 24 divisors (see below), whose sum is σ = 2674380996. Its totient is φ = 582177792.

The previous prime is 1261385563. The next prime is 1261385647. The reversal of 1261385632 is 2365831621.

It can be written as a sum of positive squares in 2 ways, for example, as 1110488976 + 150896656 = 33324^2 + 12284^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1261385591 and 1261385600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515673 + ... + 1516504.

Almost surely, 2^1261385632 is an apocalyptic number.

It is an amenable number.

1261385632 is an abundant number, since it is smaller than the sum of its proper divisors (1412995364).

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

1261385632 is a wasteful number, since it uses less digits than its factorization.

1261385632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032200 (or 3032192 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 1261385632 is about 35515.9912152259. The cubic root of 1261385632 is about 1080.4780782351.

The spelling of 1261385632 in words is "one billion, two hundred sixty-one million, three hundred eighty-five thousand, six hundred thirty-two".