49815 has 24 divisors (see below), whose sum is σ = 91728. Its totient is φ = 25920.

The previous prime is 49811. The next prime is 49823. The reversal of 49815 is 51894.

49815 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 49815 - 2² = 49811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 11.

It is a nialpdrome in base 9 and base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 49815.

It is not an unprimeable number, because it can be changed into a prime (49811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1195 + ... + 1235.

It is an arithmetic number, because the mean of its divisors is an integer number (3822).

2⁴⁹⁸¹⁵ is an apocalyptic number.

49815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

49815 is a deficient number, since it is larger than the sum of its proper divisors (41913).

49815 is an equidigital number, since it uses as much as digits as its factorization.

49815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 49 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 49815 is about 223.1927418175. The cubic root of 49815 is about 36.7948224442.

The spelling of 49815 in words is "forty-nine thousand, eight hundred fifteen".