1261236432 has 40 divisors (see below), whose sum is σ = 3277049184. Its totient is φ = 417979264.

The previous prime is 1261236413. The next prime is 1261236437. The reversal of 1261236432 is 2346321621.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1261236432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261236437) 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, 67638 + ... + 84245.

Almost surely, 2^1261236432 is an apocalyptic number.

1261236432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261236432 is an abundant number, since it is smaller than the sum of its proper divisors (2015812752).

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

1261236432 is a wasteful number, since it uses less digits than its factorization.

1261236432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152067 (or 152061 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 1261236432 is about 35513.8906908269. The cubic root of 1261236432 is about 1080.4354759619.

The spelling of 1261236432 in words is "one billion, two hundred sixty-one million, two hundred thirty-six thousand, four hundred thirty-two".