47979139 has 4 divisors (see below), whose sum is σ = 51669856. Its totient is φ = 44288424.

The previous prime is 47979131. The next prime is 47979157. The reversal of 47979139 is 93197974.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93197974 = 2 ⋅46598987.

It is a cyclic number.

It is not a de Polignac number, because 47979139 - 2³ = 47979131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47979092 and 47979101.

It is not an unprimeable number, because it can be changed into a prime (47979131) 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, 1845339 + ... + 1845364.

It is an arithmetic number, because the mean of its divisors is an integer number (12917464).

Almost surely, 2^47979139 is an apocalyptic number.

47979139 is a deficient number, since it is larger than the sum of its proper divisors (3690717).

47979139 is a wasteful number, since it uses less digits than its factorization.

47979139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690716.

The product of its digits is 428652, while the sum is 49.

The square root of 47979139 is about 6926.6975536687. The cubic root of 47979139 is about 363.3714623921.

The spelling of 47979139 in words is "forty-seven million, nine hundred seventy-nine thousand, one hundred thirty-nine".