139691290 has 8 divisors (see below), whose sum is σ = 251444340. Its totient is φ = 55876512.

The previous prime is 139691273. The next prime is 139691297. The reversal of 139691290 is 92196931.

It can be written as a sum of positive squares in 2 ways, for example, as 138086001 + 1605289 = 11751^2 + 1267^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139691297) 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, 6984555 + ... + 6984574.

Almost surely, 2^139691290 is an apocalyptic number.

139691290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139691290 is a deficient number, since it is larger than the sum of its proper divisors (111753050).

139691290 is a wasteful number, since it uses less digits than its factorization.

139691290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13969136.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 139691290 is about 11819.1069882627. The cubic root of 139691290 is about 518.8674686317.

The spelling of 139691290 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, two hundred ninety".