139531280 has 80 divisors (see below), whose sum is σ = 372964224. Its totient is φ = 47554560.

The previous prime is 139531277. The next prime is 139531313. The reversal of 139531280 is 82135931.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107435 + ... + 108725.

Almost surely, 2^139531280 is an apocalyptic number.

139531280 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 139531280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186482112).

139531280 is an abundant number, since it is smaller than the sum of its proper divisors (233432944).

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

139531280 is a wasteful number, since it uses less digits than its factorization.

139531280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 139531280 is about 11812.3359247864. The cubic root of 139531280 is about 518.6692799355.

The spelling of 139531280 in words is "one hundred thirty-nine million, five hundred thirty-one thousand, two hundred eighty".