49999440 has 80 divisors (see below), whose sum is σ = 155990016. Its totient is φ = 13248000.

The previous prime is 49999427. The next prime is 49999441. The reversal of 49999440 is 4499994.

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 (48).

It is a self number, because there is not a number n which added to its sum of digits gives 49999440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49999441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42865 + ... + 44015.

Almost surely, 2^49999440 is an apocalyptic number.

49999440 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 49999440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77995008).

49999440 is an abundant number, since it is smaller than the sum of its proper divisors (105990576).

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

49999440 is a wasteful number, since it uses less digits than its factorization.

49999440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 49999440 is about 7071.0282137749. The cubic root of 49999440 is about 368.4017744871.

The spelling of 49999440 in words is "forty-nine million, nine hundred ninety-nine thousand, four hundred forty".