1255378538 has 4 divisors (see below), whose sum is σ = 1883067810. Its totient is φ = 627689268.

The previous prime is 1255378499. The next prime is 1255378541. The reversal of 1255378538 is 8358735521.

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

It can be written as a sum of positive squares in only one way, i.e., 1232501449 + 22877089 = 35107^2 + 4783^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1255378492 and 1255378501.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313844633 + ... + 313844636.

Almost surely, 2^1255378538 is an apocalyptic number.

1255378538 is a deficient number, since it is larger than the sum of its proper divisors (627689272).

1255378538 is an equidigital number, since it uses as much as digits as its factorization.

1255378538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627689271.

The product of its digits is 1008000, while the sum is 47.

The square root of 1255378538 is about 35431.3214261055. The cubic root of 1255378538 is about 1078.7601621470.

The spelling of 1255378538 in words is "one billion, two hundred fifty-five million, three hundred seventy-eight thousand, five hundred thirty-eight".