1291392 has 96 divisors (see below), whose sum is σ = 3978000. Its totient is φ = 400896.

The previous prime is 1291391. The next prime is 1291421. The reversal of 1291392 is 2931921.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is not an unprimeable number, because it can be changed into a prime (1291391) 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, 21859 + ... + 21917.

2^1291392 is an apocalyptic number.

1291392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989000).

1291392 is an abundant number, since it is smaller than the sum of its proper divisors (2686608).

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

1291392 is a wasteful number, since it uses less digits than its factorization.

1291392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 83 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1291392 is about 1136.3942977682. The cubic root of 1291392 is about 108.8978646557.

It can be divided in two parts, 129 and 1392, that added together give a square (1521 = 39²).

The spelling of 1291392 in words is "one million, two hundred ninety-one thousand, three hundred ninety-two".