139400784 has 80 divisors (see below), whose sum is σ = 402970240. Its totient is φ = 46137600.

The previous prime is 139400747. The next prime is 139400791. The reversal of 139400784 is 487004931.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64164 + ... + 66300.

It is an arithmetic number, because the mean of its divisors is an integer number (5037128).

Almost surely, 2^139400784 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 139400784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201485120).

139400784 is an abundant number, since it is smaller than the sum of its proper divisors (263569456).

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

139400784 is a wasteful number, since it uses less digits than its factorization.

139400784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305 (or 2293 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 139400784 is about 11806.8109157384. The cubic root of 139400784 is about 518.5075351334.

The spelling of 139400784 in words is "one hundred thirty-nine million, four hundred thousand, seven hundred eighty-four".