139904532 has 18 divisors (see below), whose sum is σ = 353647658. Its totient is φ = 46634832.

The previous prime is 139904503. The next prime is 139904579. The reversal of 139904532 is 235409931.

It is a happy number.

139904532 is a `hidden beast` number, since 1 + 39 + 90 + 4 + 532 = 666.

It can be written as a sum of positive squares in only one way, i.e., 137452176 + 2452356 = 11724^2 + 1566^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3886237 = 139904532 / (1 + 3 + 9 + 9 + 0 + 4 + 5 + 3 + 2).

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 5 ways as a sum of consecutive naturals, for example, 1943083 + ... + 1943154.

Almost surely, 2^139904532 is an apocalyptic number.

139904532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139904532 is an abundant number, since it is smaller than the sum of its proper divisors (213743126).

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

139904532 is a wasteful number, since it uses less digits than its factorization.

139904532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886247 (or 3886242 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 139904532 is about 11828.1246188904. The cubic root of 139904532 is about 519.1313554831.

The spelling of 139904532 in words is "one hundred thirty-nine million, nine hundred four thousand, five hundred thirty-two".