12621542 has 4 divisors (see below), whose sum is σ = 18932316. Its totient is φ = 6310770.

The previous prime is 12621541. The next prime is 12621547. The reversal of 12621542 is 24512621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3155384 + ... + 3155387.

It is an arithmetic number, because the mean of its divisors is an integer number (4733079).

Almost surely, 2^12621542 is an apocalyptic number.

12621542 is a deficient number, since it is larger than the sum of its proper divisors (6310774).

12621542 is an equidigital number, since it uses as much as digits as its factorization.

12621542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310773.

The product of its digits is 960, while the sum is 23.

The square root of 12621542 is about 3552.6809595009. The cubic root of 12621542 is about 232.8292141237.

The spelling of 12621542 in words is "twelve million, six hundred twenty-one thousand, five hundred forty-two".