1250320405 has 4 divisors (see below), whose sum is σ = 1500384492. Its totient is φ = 1000256320.

The previous prime is 1250320381. The next prime is 1250320447. The reversal of 1250320405 is 5040230521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5040230521 = 739 ⋅6820339.

It can be written as a sum of positive squares in 2 ways, for example, as 712729809 + 537590596 = 26697^2 + 23186^2 .

It is not a de Polignac number, because 1250320405 - 2⁷ = 1250320277 is a prime.

It is a super-2 number, since 2×1250320405² = 3126602230318728050, 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125032036 + ... + 125032045.

It is an arithmetic number, because the mean of its divisors is an integer number (375096123).

Almost surely, 2^1250320405 is an apocalyptic number.

It is an amenable number.

1250320405 is a deficient number, since it is larger than the sum of its proper divisors (250064087).

1250320405 is an equidigital number, since it uses as much as digits as its factorization.

1250320405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250064086.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 1250320405 is about 35359.8699799646. The cubic root of 1250320405 is about 1077.3093760394.

Adding to 1250320405 its reverse (5040230521), we get a palindrome (6290550926).

The spelling of 1250320405 in words is "one billion, two hundred fifty million, three hundred twenty thousand, four hundred five".