1838979157 has 2 divisors, whose sum is σ = 1838979158. Its totient is φ = 1838979156.

The previous prime is 1838979127. The next prime is 1838979167. The reversal of 1838979157 is 7519798381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115960836 + 723018321 = 33406^2 + 26889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1838979157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1838979127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919489578 + 919489579.

It is an arithmetic number, because the mean of its divisors is an integer number (919489579).

Almost surely, 2^1838979157 is an apocalyptic number.

It is an amenable number.

1838979157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838979157 is an equidigital number, since it uses as much as digits as its factorization.

1838979157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 58.

The square root of 1838979157 is about 42883.3202655765. The cubic root of 1838979157 is about 1225.1584761237.

The spelling of 1838979157 in words is "one billion, eight hundred thirty-eight million, nine hundred seventy-nine thousand, one hundred fifty-seven".