49278439 has 4 divisors (see below), whose sum is σ = 56318224. Its totient is φ = 42238656.

The previous prime is 49278421. The next prime is 49278469. The reversal of 49278439 is 93487294.

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: 93487294 = 2 ⋅46743647.

It is a cyclic number.

It is not a de Polignac number, because 49278439 - 2⁷ = 49278311 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 (49278409) 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, 3519882 + ... + 3519895.

It is an arithmetic number, because the mean of its divisors is an integer number (14079556).

Almost surely, 2^49278439 is an apocalyptic number.

49278439 is a deficient number, since it is larger than the sum of its proper divisors (7039785).

49278439 is an equidigital number, since it uses as much as digits as its factorization.

49278439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039784.

The product of its digits is 435456, while the sum is 46.

The square root of 49278439 is about 7019.8603262458. The cubic root of 49278439 is about 366.6223870312.

It can be divided in two parts, 4927 and 8439, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 49278439 in words is "forty-nine million, two hundred seventy-eight thousand, four hundred thirty-nine".