104639440 has 20 divisors (see below), whose sum is σ = 243286884. Its totient is φ = 41855744.

The previous prime is 104639419. The next prime is 104639449. The reversal of 104639440 is 44936401.

It can be written as a sum of positive squares in 2 ways, for example, as 70627216 + 34012224 = 8404^2 + 5832^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104639449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653917 + ... + 654076.

Almost surely, 2^104639440 is an apocalyptic number.

104639440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

104639440 is an abundant number, since it is smaller than the sum of its proper divisors (138647444).

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

104639440 is a wasteful number, since it uses less digits than its factorization.

104639440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308006 (or 1308000 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 104639440 is about 10229.3421098329. The cubic root of 104639440 is about 471.2287750152.

The spelling of 104639440 in words is "one hundred four million, six hundred thirty-nine thousand, four hundred forty".