139906470 has 64 divisors (see below), whose sum is σ = 382247424. Its totient is φ = 32440320.

The previous prime is 139906463. The next prime is 139906511. The reversal of 139906470 is 74609931.

139906470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1627 + ... + 16806.

It is an arithmetic number, because the mean of its divisors is an integer number (5972616).

Almost surely, 2^139906470 is an apocalyptic number.

139906470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139906470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191123712).

139906470 is an abundant number, since it is smaller than the sum of its proper divisors (242340954).

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

139906470 is a wasteful number, since it uses less digits than its factorization.

139906470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18477.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 139906470 is about 11828.2065419911. The cubic root of 139906470 is about 519.1337525270.

It can be divided in two parts, 139 and 906470, that added together give a palindrome (906609).

The spelling of 139906470 in words is "one hundred thirty-nine million, nine hundred six thousand, four hundred seventy".