139520440 has 48 divisors (see below), whose sum is σ = 320945400. Its totient is φ = 54586176.

The previous prime is 139520413. The next prime is 139520449. The reversal of 139520440 is 44025931.

It is a junction number, because it is equal to n+sod(n) for n = 139520399 and 139520408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139520449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87571 + ... + 89149.

Almost surely, 2^139520440 is an apocalyptic number.

139520440 is a gapful number since it is divisible by the number (10) 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 139520440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160472700).

139520440 is an abundant number, since it is smaller than the sum of its proper divisors (181424960).

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

139520440 is a wasteful number, since it uses less digits than its factorization.

139520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 139520440 is about 11811.8770735222. The cubic root of 139520440 is about 518.6558480116.

The spelling of 139520440 in words is "one hundred thirty-nine million, five hundred twenty thousand, four hundred forty".