139387730 has 16 divisors (see below), whose sum is σ = 251835480. Its totient is φ = 55546752.

The previous prime is 139387693. The next prime is 139387747. The reversal of 139387730 is 37783931.

It can be written as a sum of positive squares in 4 ways, for example, as 68541841 + 70845889 = 8279^2 + 8417^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23219 + ... + 28598.

Almost surely, 2^139387730 is an apocalyptic number.

139387730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139387730 is a deficient number, since it is larger than the sum of its proper divisors (112447750).

139387730 is a wasteful number, since it uses less digits than its factorization.

139387730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52093.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 139387730 is about 11806.2580862863. The cubic root of 139387730 is about 518.4913496466.

The spelling of 139387730 in words is "one hundred thirty-nine million, three hundred eighty-seven thousand, seven hundred thirty".