126402805 has 4 divisors (see below), whose sum is σ = 151683372. Its totient is φ = 101122240.

The previous prime is 126402761. The next prime is 126402821. The reversal of 126402805 is 508204621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 86750596 + 39652209 = 9314^2 + 6297^2 .

It is not a de Polignac number, because 126402805 - 2¹³ = 126394613 is a prime.

It is a super-2 number, since 2×126402805² = 31955338223736050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 12640276 + ... + 12640285.

It is an arithmetic number, because the mean of its divisors is an integer number (37920843).

Almost surely, 2^126402805 is an apocalyptic number.

It is an amenable number.

126402805 is a deficient number, since it is larger than the sum of its proper divisors (25280567).

126402805 is an equidigital number, since it uses as much as digits as its factorization.

126402805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25280566.

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

The square root of 126402805 is about 11242.9002041288. The cubic root of 126402805 is about 501.8634531239.

The spelling of 126402805 in words is "one hundred twenty-six million, four hundred two thousand, eight hundred five".