439639640 has 32 divisors (see below), whose sum is σ = 1079116560. Its totient is φ = 159868800.

The previous prime is 439639639. The next prime is 439639643. The reversal of 439639640 is 46936934.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 439639591 and 439639600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439639643) 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, 499151 + ... + 500030.

Almost surely, 2^439639640 is an apocalyptic number.

439639640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

439639640 is an abundant number, since it is smaller than the sum of its proper divisors (639476920).

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

439639640 is a wasteful number, since it uses less digits than its factorization.

439639640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999203 (or 999199 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 44.

The square root of 439639640 is about 20967.5854594658. The cubic root of 439639640 is about 760.3827942361.

The spelling of 439639640 in words is "four hundred thirty-nine million, six hundred thirty-nine thousand, six hundred forty".