7838854057 has 2 divisors, whose sum is σ = 7838854058. Its totient is φ = 7838854056.

The previous prime is 7838854031. The next prime is 7838854061. The reversal of 7838854057 is 7504588387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4653831961 + 3185022096 = 68219^2 + 56436^2 .

It is a cyclic number.

It is not a de Polignac number, because 7838854057 - 2²³ = 7830465449 is a prime.

It is a super-2 number, since 2×7838854057² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7838853989 and 7838854007.

It is not a weakly prime, because it can be changed into another prime (7838854097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3919427028 + 3919427029.

It is an arithmetic number, because the mean of its divisors is an integer number (3919427029).

Almost surely, 2^7838854057 is an apocalyptic number.

It is an amenable number.

7838854057 is a deficient number, since it is larger than the sum of its proper divisors (1).

7838854057 is an equidigital number, since it uses as much as digits as its factorization.

7838854057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The square root of 7838854057 is about 88537.3031947551. The cubic root of 7838854057 is about 1986.4799819169.

The spelling of 7838854057 in words is "seven billion, eight hundred thirty-eight million, eight hundred fifty-four thousand, fifty-seven".