139578442 has 8 divisors (see below), whose sum is σ = 209480832. Its totient is φ = 69751500.

The previous prime is 139578419. The next prime is 139578443. The reversal of 139578442 is 244875931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×139578442² = 38964282942294728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139578443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13984 + ... + 21787.

It is an arithmetic number, because the mean of its divisors is an integer number (26185104).

Almost surely, 2^139578442 is an apocalyptic number.

139578442 is a deficient number, since it is larger than the sum of its proper divisors (69902390).

139578442 is a wasteful number, since it uses less digits than its factorization.

139578442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37724.

The product of its digits is 241920, while the sum is 43.

The square root of 139578442 is about 11814.3320589867. The cubic root of 139578442 is about 518.7277106211.

The spelling of 139578442 in words is "one hundred thirty-nine million, five hundred seventy-eight thousand, four hundred forty-two".