12737421 has 12 divisors (see below), whose sum is σ = 18496348. Its totient is φ = 8446464.

The previous prime is 12737399. The next prime is 12737441. The reversal of 12737421 is 12473721.

It is a happy number.

12737421 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 11634921 = 1050^2 + 3411^2 .

It is not a de Polignac number, because 12737421 - 2⁶ = 12737357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12737441) 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, 1930 + ... + 5403.

Almost surely, 2^12737421 is an apocalyptic number.

It is an amenable number.

12737421 is a deficient number, since it is larger than the sum of its proper divisors (5758927).

12737421 is a wasteful number, since it uses less digits than its factorization.

12737421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7532 (or 7529 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 12737421 is about 3568.9523672921. The cubic root of 12737421 is about 233.5395833955.

The spelling of 12737421 in words is "twelve million, seven hundred thirty-seven thousand, four hundred twenty-one".