139817087 has 4 divisors (see below), whose sum is σ = 139842216. Its totient is φ = 139791960.

The previous prime is 139817081. The next prime is 139817101. The reversal of 139817087 is 780718931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139817087 - 2²² = 135622783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139817081) 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, 89 + ... + 16722.

It is an arithmetic number, because the mean of its divisors is an integer number (34960554).

Almost surely, 2^139817087 is an apocalyptic number.

139817087 is a deficient number, since it is larger than the sum of its proper divisors (25129).

139817087 is an equidigital number, since it uses as much as digits as its factorization.

139817087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25128.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 139817087 is about 11824.4275548544. The cubic root of 139817087 is about 519.0231748023.

The spelling of 139817087 in words is "one hundred thirty-nine million, eight hundred seventeen thousand, eighty-seven".