1261340432 has 80 divisors (see below), whose sum is σ = 2869530624. Its totient is φ = 530688000.

The previous prime is 1261340407. The next prime is 1261340453. The reversal of 1261340432 is 2340431621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179057 + ... + 185967.

Almost surely, 2^1261340432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261340432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434765312).

1261340432 is an abundant number, since it is smaller than the sum of its proper divisors (1608190192).

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

1261340432 is a wasteful number, since it uses less digits than its factorization.

1261340432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008 (or 7002 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1261340432 is about 35515.3548764475. The cubic root of 1261340432 is about 1080.4651722711.

The spelling of 1261340432 in words is "one billion, two hundred sixty-one million, three hundred forty thousand, four hundred thirty-two".