1255722638 has 8 divisors (see below), whose sum is σ = 1884825288. Its totient is φ = 627447544.

The previous prime is 1255722631. The next prime is 1255722647. The reversal of 1255722638 is 8362275521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1255722595 and 1255722604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255722631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203081 + ... + 209172.

It is an arithmetic number, because the mean of its divisors is an integer number (235603161).

Almost surely, 2^1255722638 is an apocalyptic number.

1255722638 is a deficient number, since it is larger than the sum of its proper divisors (629102650).

1255722638 is a wasteful number, since it uses less digits than its factorization.

1255722638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413778.

The product of its digits is 201600, while the sum is 41.

The square root of 1255722638 is about 35436.1769664844. The cubic root of 1255722638 is about 1078.8587160758.

The spelling of 1255722638 in words is "one billion, two hundred fifty-five million, seven hundred twenty-two thousand, six hundred thirty-eight".