49381840 has 20 divisors (see below), whose sum is σ = 114812964. Its totient is φ = 19752704.

The previous prime is 49381823. The next prime is 49381847. The reversal of 49381840 is 4818394.

It can be written as a sum of positive squares in 2 ways, for example, as 5345344 + 44036496 = 2312^2 + 6636^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×49381840² = 4877132243571200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 49381840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49381847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308557 + ... + 308716.

Almost surely, 2^49381840 is an apocalyptic number.

49381840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

49381840 is an abundant number, since it is smaller than the sum of its proper divisors (65431124).

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

49381840 is a wasteful number, since it uses less digits than its factorization.

49381840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617286 (or 617280 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 49381840 is about 7027.2213569803. The cubic root of 49381840 is about 366.8786359314.

The spelling of 49381840 in words is "forty-nine million, three hundred eighty-one thousand, eight hundred forty".