49721840 has 40 divisors (see below), whose sum is σ = 132119520. Its totient is φ = 17047296.

The previous prime is 49721813. The next prime is 49721849. The reversal of 49721840 is 4812794.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×49721840² = 4944522745971200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 49721840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49721849) 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, 43835 + ... + 44954.

It is an arithmetic number, because the mean of its divisors is an integer number (3302988).

Almost surely, 2^49721840 is an apocalyptic number.

49721840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

49721840 is an abundant number, since it is smaller than the sum of its proper divisors (82397680).

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

49721840 is a wasteful number, since it uses less digits than its factorization.

49721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88809 (or 88803 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 49721840 is about 7051.3714978010. The cubic root of 49721840 is about 367.7187122684.

The spelling of 49721840 in words is "forty-nine million, seven hundred twenty-one thousand, eight hundred forty".