1213992 has 48 divisors (see below), whose sum is σ = 3543540. Its totient is φ = 373248.

The previous prime is 1213981. The next prime is 1214011. The reversal of 1213992 is 2993121.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 34596 = 1086^2 + 186^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288 + ... + 1584.

2^1213992 is an apocalyptic number.

1213992 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 1213992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1771770).

1213992 is an abundant number, since it is smaller than the sum of its proper divisors (2329548).

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

1213992 is a wasteful number, since it uses less digits than its factorization.

1213992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322 (or 1315 counting only the distinct ones).

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

The square root of 1213992 is about 1101.8130512932. The cubic root of 1213992 is about 106.6772819297.

The spelling of 1213992 in words is "one million, two hundred thirteen thousand, nine hundred ninety-two".