126521438 has 4 divisors (see below), whose sum is σ = 189782160. Its totient is φ = 63260718.

The previous prime is 126521431. The next prime is 126521443. The reversal of 126521438 is 834125621.

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 (126521431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31630358 + ... + 31630361.

It is an arithmetic number, because the mean of its divisors is an integer number (47445540).

Almost surely, 2^126521438 is an apocalyptic number.

126521438 is a deficient number, since it is larger than the sum of its proper divisors (63260722).

126521438 is an equidigital number, since it uses as much as digits as its factorization.

126521438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63260721.

The product of its digits is 11520, while the sum is 32.

The square root of 126521438 is about 11248.1748741740. The cubic root of 126521438 is about 502.0204088992.

The spelling of 126521438 in words is "one hundred twenty-six million, five hundred twenty-one thousand, four hundred thirty-eight".