139561280 has 56 divisors (see below), whose sum is σ = 333820008. Its totient is φ = 55574528.

The previous prime is 139561267. The next prime is 139561337. The reversal of 139561280 is 82165931.

It can be written as a sum of positive squares in 4 ways, for example, as 92006464 + 47554816 = 9592^2 + 6896^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139561280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81392 + ... + 83088.

Almost surely, 2^139561280 is an apocalyptic number.

139561280 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 139561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166910004).

139561280 is an abundant number, since it is smaller than the sum of its proper divisors (194258728).

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

139561280 is a wasteful number, since it uses less digits than its factorization.

139561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1961 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 139561280 is about 11813.6057154452. The cubic root of 139561280 is about 518.7064495302.

The spelling of 139561280 in words is "one hundred thirty-nine million, five hundred sixty-one thousand, two hundred eighty".