139804691 has 4 divisors (see below), whose sum is σ = 150558912. Its totient is φ = 129050472.

The previous prime is 139804673. The next prime is 139804703. The reversal of 139804691 is 196408931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196408931 = 79 ⋅2486189.

It is a cyclic number.

It is not a de Polignac number, because 139804691 - 2⁶ = 139804627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139807691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5377091 + ... + 5377116.

It is an arithmetic number, because the mean of its divisors is an integer number (37639728).

Almost surely, 2^139804691 is an apocalyptic number.

139804691 is a deficient number, since it is larger than the sum of its proper divisors (10754221).

139804691 is a wasteful number, since it uses less digits than its factorization.

139804691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10754220.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 139804691 is about 11823.9033740977. The cubic root of 139804691 is about 519.0078357104.

The spelling of 139804691 in words is "one hundred thirty-nine million, eight hundred four thousand, six hundred ninety-one".