48978391 has 24 divisors (see below), whose sum is σ = 62914320. Its totient is φ = 37699200.

The previous prime is 48978389. The next prime is 48978443. The reversal of 48978391 is 19387984.

It is a happy number.

It is not a de Polignac number, because 48978391 - 2¹ = 48978389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (48978301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47461 + ... + 48481.

It is an arithmetic number, because the mean of its divisors is an integer number (2621430).

Almost surely, 2^48978391 is an apocalyptic number.

48978391 is a deficient number, since it is larger than the sum of its proper divisors (13935929).

48978391 is a wasteful number, since it uses less digits than its factorization.

48978391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1128 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 48978391 is about 6998.4563297916. The cubic root of 48978391 is about 365.8767712990.

The spelling of 48978391 in words is "forty-eight million, nine hundred seventy-eight thousand, three hundred ninety-one".