49409640 has 144 divisors (see below), whose sum is σ = 186865380. Its totient is φ = 11289600.

The previous prime is 49409611. The next prime is 49409653. The reversal of 49409640 is 4690494.

49409640 is a `hidden beast` number, since 4 + 9 + 4 + 0 + 9 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49196196 + 213444 = 7014^2 + 462^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 49409595 and 49409604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16240 + ... + 19040.

Almost surely, 2^49409640 is an apocalyptic number.

49409640 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 49409640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93432690).

49409640 is an abundant number, since it is smaller than the sum of its proper divisors (137455740).

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

49409640 is a wasteful number, since it uses less digits than its factorization.

49409640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832 (or 2818 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 49409640 is about 7029.1991008934. The cubic root of 49409640 is about 366.9474690136.

The spelling of 49409640 in words is "forty-nine million, four hundred nine thousand, six hundred forty".