139609440 has 192 divisors, whose sum is σ = 517648320. Its totient is φ = 35020800.

The previous prime is 139609429. The next prime is 139609447. The reversal of 139609440 is 44906931.

139609440 is a `hidden beast` number, since 1 + 3 + 9 + 609 + 4 + 40 = 666.

It is a super-2 number, since 2×139609440² = 38981591474227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 139609395 and 139609404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139609447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72490 + ... + 74390.

It is an arithmetic number, because the mean of its divisors is an integer number (2696085).

Almost surely, 2^139609440 is an apocalyptic number.

139609440 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 139609440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258824160).

139609440 is an abundant number, since it is smaller than the sum of its proper divisors (378038880).

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

139609440 is a wasteful number, since it uses less digits than its factorization.

139609440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1928 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 139609440 is about 11815.6438673481. The cubic root of 139609440 is about 518.7661079819.

The spelling of 139609440 in words is "one hundred thirty-nine million, six hundred nine thousand, four hundred forty".