139647408 has 80 divisors (see below), whose sum is σ = 369663840. Its totient is φ = 45416448.

The previous prime is 139647407. The next prime is 139647413. The reversal of 139647408 is 804746931.

It is a super-2 number, since 2×139647408² = 39002797122236928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139647408.

It is not an unprimeable number, because it can be changed into a prime (139647407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414216 + ... + 414552.

It is an arithmetic number, because the mean of its divisors is an integer number (4620798).

Almost surely, 2^139647408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139647408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184831920).

139647408 is an abundant number, since it is smaller than the sum of its proper divisors (230016432).

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

139647408 is a wasteful number, since it uses less digits than its factorization.

139647408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 139647408 is about 11817.2504416214. The cubic root of 139647408 is about 518.8131313693.

The spelling of 139647408 in words is "one hundred thirty-nine million, six hundred forty-seven thousand, four hundred eight".