49278919 has 4 divisors (see below), whose sum is σ = 49609800. Its totient is φ = 48948040.

The previous prime is 49278851. The next prime is 49278941. The reversal of 49278919 is 91987294.

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

It is a cyclic number.

It is not a de Polignac number, because 49278919 - 2¹⁹ = 48754631 is a prime.

It is a super-2 number, since 2×49278919² = 4856823715617122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49278319) 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, 165217 + ... + 165514.

It is an arithmetic number, because the mean of its divisors is an integer number (12402450).

Almost surely, 2^49278919 is an apocalyptic number.

49278919 is a deficient number, since it is larger than the sum of its proper divisors (330881).

49278919 is a wasteful number, since it uses less digits than its factorization.

49278919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330880.

The product of its digits is 326592, while the sum is 49.

The square root of 49278919 is about 7019.8945148770. The cubic root of 49278919 is about 366.6235773975.

The spelling of 49278919 in words is "forty-nine million, two hundred seventy-eight thousand, nine hundred nineteen".