1948788157 has 4 divisors (see below), whose sum is σ = 1948920156. Its totient is φ = 1948656160.

The previous prime is 1948788151. The next prime is 1948788161. The reversal of 1948788157 is 7518878491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 457360996 + 1491427161 = 21386^2 + 38619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1948788157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1948788151) 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, 40594 + ... + 74467.

It is an arithmetic number, because the mean of its divisors is an integer number (487230039).

Almost surely, 2^1948788157 is an apocalyptic number.

It is an amenable number.

1948788157 is a deficient number, since it is larger than the sum of its proper divisors (131999).

1948788157 is a wasteful number, since it uses less digits than its factorization.

1948788157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131998.

The product of its digits is 4515840, while the sum is 58.

The square root of 1948788157 is about 44145.0807791763. The cubic root of 1948788157 is about 1249.0741211947.

The spelling of 1948788157 in words is "one billion, nine hundred forty-eight million, seven hundred eighty-eight thousand, one hundred fifty-seven".