1281432 has 32 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 422304.

The previous prime is 1281431. The next prime is 1281433. The reversal of 1281432 is 2341821.

It is an interprime number because it is at equal distance from previous prime (1281431) and next prime (1281433).

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

It is a junction number, because it is equal to n+sod(n) for n = 1281399 and 1281408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281431) 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, 2319 + ... + 2817.

It is an arithmetic number, because the mean of its divisors is an integer number (101250).

2^1281432 is an apocalyptic number.

1281432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1281432 is an abundant number, since it is smaller than the sum of its proper divisors (1958568).

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

1281432 is a wasteful number, since it uses less digits than its factorization.

1281432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 611 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1281432 is about 1132.0035335634. The cubic root of 1281432 is about 108.6171796365.

The spelling of 1281432 in words is "one million, two hundred eighty-one thousand, four hundred thirty-two".