139031640 has 320 divisors, whose sum is σ = 526901760. Its totient is φ = 32590080.

The previous prime is 139031609. The next prime is 139031657. The reversal of 139031640 is 46130931.

139031640 is a `hidden beast` number, since 13 + 9 + 0 + 3 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 79 ways as a sum of consecutive naturals, for example, 1675039 + ... + 1675121.

It is an arithmetic number, because the mean of its divisors is an integer number (1646568).

Almost surely, 2^139031640 is an apocalyptic number.

139031640 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 139031640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263450880).

139031640 is an abundant number, since it is smaller than the sum of its proper divisors (387870120).

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

139031640 is a wasteful number, since it uses less digits than its factorization.

139031640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 139031640 is about 11791.1678810879. The cubic root of 139031640 is about 518.0494479314.

The spelling of 139031640 in words is "one hundred thirty-nine million, thirty-one thousand, six hundred forty".