1138678357 has 2 divisors, whose sum is σ = 1138678358. Its totient is φ = 1138678356.

The previous prime is 1138678337. The next prime is 1138678381. The reversal of 1138678357 is 7538768311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1137105841 + 1572516 = 33721^2 + 1254^2 .

It is an emirp because it is prime and its reverse (7538768311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1138678357 - 2²³ = 1130289749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1138678357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138678327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569339178 + 569339179.

It is an arithmetic number, because the mean of its divisors is an integer number (569339179).

Almost surely, 2^1138678357 is an apocalyptic number.

It is an amenable number.

1138678357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138678357 is an equidigital number, since it uses as much as digits as its factorization.

1138678357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 1138678357 is about 33744.3085126959. The cubic root of 1138678357 is about 1044.2400729564.

The spelling of 1138678357 in words is "one billion, one hundred thirty-eight million, six hundred seventy-eight thousand, three hundred fifty-seven".