12992421 has 8 divisors (see below), whose sum is σ = 18655840. Its totient is φ = 7995312.

The previous prime is 12992417. The next prime is 12992423. The reversal of 12992421 is 12429921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12992421 - 2² = 12992417 is a prime.

It is the 3605-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12992423) by changing a digit.

It is a nontrivial repunit in base 3604.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166531 + ... + 166608.

It is an arithmetic number, because the mean of its divisors is an integer number (2331980).

Almost surely, 2^12992421 is an apocalyptic number.

It is an amenable number.

12992421 is a deficient number, since it is larger than the sum of its proper divisors (5663419).

12992421 is a wasteful number, since it uses less digits than its factorization.

12992421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333155.

The product of its digits is 2592, while the sum is 30.

The square root of 12992421 is about 3604.5001040366. The cubic root of 12992421 is about 235.0877656185.

Subtracting from 12992421 its reverse (12429921), we obtain a square (562500 = 750²).

The spelling of 12992421 in words is "twelve million, nine hundred ninety-two thousand, four hundred twenty-one".