47992909 has 6 divisors (see below), whose sum is σ = 48834734. Its totient is φ = 47152920.

The previous prime is 47992907. The next prime is 47992913. The reversal of 47992909 is 90929974.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 19669225 = 5322^2 + 4435^2 .

It is not a de Polignac number, because 47992909 - 2¹ = 47992907 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 (47992907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53664 + ... + 54550.

Almost surely, 2^47992909 is an apocalyptic number.

It is an amenable number.

47992909 is a deficient number, since it is larger than the sum of its proper divisors (841825).

47992909 is an frugal number, since it uses more digits than its factorization.

47992909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 47992909 is about 6927.6914625292. The cubic root of 47992909 is about 363.4062215710.

The spelling of 47992909 in words is "forty-seven million, nine hundred ninety-two thousand, nine hundred nine".