126208405 has 4 divisors (see below), whose sum is σ = 151450092. Its totient is φ = 100966720.

The previous prime is 126208399. The next prime is 126208417. The reversal of 126208405 is 504802621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504802621 = 19 ⋅26568559.

It can be written as a sum of positive squares in 2 ways, for example, as 18173169 + 108035236 = 4263^2 + 10394^2 .

It is a de Polignac number, because none of the positive numbers 2^k-126208405 is a prime.

It is a super-2 number, since 2×126208405² = 31857122985288050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12620836 + ... + 12620845.

It is an arithmetic number, because the mean of its divisors is an integer number (37862523).

Almost surely, 2^126208405 is an apocalyptic number.

It is an amenable number.

126208405 is a deficient number, since it is larger than the sum of its proper divisors (25241687).

126208405 is an equidigital number, since it uses as much as digits as its factorization.

126208405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25241686.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 126208405 is about 11234.2514214344. The cubic root of 126208405 is about 501.6060423989.

It can be divided in two parts, 12620 and 8405, that added together give a square (21025 = 145²).

The spelling of 126208405 in words is "one hundred twenty-six million, two hundred eight thousand, four hundred five".