139690 has 16 divisors (see below), whose sum is σ = 256680. Its totient is φ = 54720.

The previous prime is 139681. The next prime is 139697. The reversal of 139690 is 96931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 106929 + 32761 = 327^2 + 181^2 .

It is a super-2 number, since 2×139690² = 39026592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139697) by changing a digit.

139690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496 + ... + 724.

2¹³⁹⁶⁹⁰ is an apocalyptic number.

139690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139690 is a deficient number, since it is larger than the sum of its proper divisors (116990).

139690 is a wasteful number, since it uses less digits than its factorization.

139690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 139690 is about 373.7512541785. The cubic root of 139690 is about 51.8865871440.

The spelling of 139690 in words is "one hundred thirty-nine thousand, six hundred ninety".