1270400605 has 4 divisors (see below), whose sum is σ = 1524480732. Its totient is φ = 1016320480.

The previous prime is 1270400603. The next prime is 1270400611. The reversal of 1270400605 is 5060040721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5060040721 = 9631 ⋅525391.

It can be written as a sum of positive squares in 2 ways, for example, as 224460324 + 1045940281 = 14982^2 + 32341^2 .

It is not a de Polignac number, because 1270400605 - 2¹ = 1270400603 is a prime.

It is a super-2 number, since 2×1270400605² = 3227835394368732050, which contains 22 as substring.

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 1270400605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1270400603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127040056 + ... + 127040065.

It is an arithmetic number, because the mean of its divisors is an integer number (381120183).

Almost surely, 2^1270400605 is an apocalyptic number.

It is an amenable number.

1270400605 is a deficient number, since it is larger than the sum of its proper divisors (254080127).

1270400605 is an equidigital number, since it uses as much as digits as its factorization.

1270400605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254080126.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1270400605 is about 35642.6795429300. The cubic root of 1270400605 is about 1083.0459864855.

The spelling of 1270400605 in words is "one billion, two hundred seventy million, four hundred thousand, six hundred five".