1948826857 has 2 divisors, whose sum is σ = 1948826858. Its totient is φ = 1948826856.

The previous prime is 1948826849. The next prime is 1948826881. The reversal of 1948826857 is 7586288491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 311734336 = 40461^2 + 17656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948826857 - 2³ = 1948826849 is a prime.

It is a super-2 number, since 2×1948826857² = 7595852237128996898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1948826837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974413428 + 974413429.

It is an arithmetic number, because the mean of its divisors is an integer number (974413429).

Almost surely, 2^1948826857 is an apocalyptic number.

It is an amenable number.

1948826857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948826857 is an equidigital number, since it uses as much as digits as its factorization.

1948826857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 58.

The square root of 1948826857 is about 44145.5191044346. The cubic root of 1948826857 is about 1249.0823893841.

The spelling of 1948826857 in words is "one billion, nine hundred forty-eight million, eight hundred twenty-six thousand, eight hundred fifty-seven".