47478157 has 2 divisors, whose sum is σ = 47478158. Its totient is φ = 47478156.

The previous prime is 47478121. The next prime is 47478173. The reversal of 47478157 is 75187474.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26739241 + 20738916 = 5171^2 + 4554^2 .

It is a cyclic number.

It is not a de Polignac number, because 47478157 - 2¹⁹ = 46953869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47478107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23739078 + 23739079.

It is an arithmetic number, because the mean of its divisors is an integer number (23739079).

Almost surely, 2^47478157 is an apocalyptic number.

It is an amenable number.

47478157 is a deficient number, since it is larger than the sum of its proper divisors (1).

47478157 is an equidigital number, since it uses as much as digits as its factorization.

47478157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 43.

The square root of 47478157 is about 6890.4395360528. The cubic root of 47478157 is about 362.1023005848.

The spelling of 47478157 in words is "forty-seven million, four hundred seventy-eight thousand, one hundred fifty-seven".