126405049 has 3 divisors (see below), whose sum is σ = 126416293. Its totient is φ = 126393806.

The previous prime is 126405031. The next prime is 126405067. The reversal of 126405049 is 940504621.

The square root of 126405049 is 11243.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (126405031) and next prime (126405067).

It is not a de Polignac number, because 126405049 - 2¹³ = 126396857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126405049.

It is not an unprimeable number, because it can be changed into a prime (126405029) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5622 + ... + 16864.

Almost surely, 2^126405049 is an apocalyptic number.

126405049 is the 11243-rd square number.

126405049 is the 5622-nd centered octagonal number.

It is an amenable number.

126405049 is a deficient number, since it is larger than the sum of its proper divisors (11244).

126405049 is an frugal number, since it uses more digits than its factorization.

126405049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22486 (or 11243 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The cubic root of 126405049 is about 501.8664229286.

It can be divided in two parts, 12640 and 5049, that added together give a square (17689 = 133²).

The spelling of 126405049 in words is "one hundred twenty-six million, four hundred five thousand, forty-nine".