49123840 has 80 divisors (see below), whose sum is σ = 121777920. Its totient is φ = 18984960.

The previous prime is 49123831. The next prime is 49123843. The reversal of 49123840 is 4832194.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (49123843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79051 + ... + 79669.

It is an arithmetic number, because the mean of its divisors is an integer number (1522224).

Almost surely, 2^49123840 is an apocalyptic number.

49123840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49123840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60888960).

49123840 is an abundant number, since it is smaller than the sum of its proper divisors (72654080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

49123840 is an equidigital number, since it uses as much as digits as its factorization.

49123840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 49123840 is about 7008.8401322901. The cubic root of 49123840 is about 366.2385894941.

The spelling of 49123840 in words is "forty-nine million, one hundred twenty-three thousand, eight hundred forty".