49381987 has 4 divisors (see below), whose sum is σ = 49408920. Its totient is φ = 49355056.

The previous prime is 49381979. The next prime is 49382029. The reversal of 49381987 is 78918394.

It is a happy number.

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 49381987 - 2³ = 49381979 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49381987.

It is not an unprimeable number, because it can be changed into a prime (49381907) 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, 10498 + ... + 14455.

It is an arithmetic number, because the mean of its divisors is an integer number (12352230).

Almost surely, 2^49381987 is an apocalyptic number.

49381987 is a deficient number, since it is larger than the sum of its proper divisors (26933).

49381987 is a wasteful number, since it uses less digits than its factorization.

49381987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26932.

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

The square root of 49381987 is about 7027.2318162986. The cubic root of 49381987 is about 366.8789999728.

The spelling of 49381987 in words is "forty-nine million, three hundred eighty-one thousand, nine hundred eighty-seven".