157805207 has 4 divisors (see below), whose sum is σ = 180348816. Its totient is φ = 135261600.

The previous prime is 157805201. The next prime is 157805213. The reversal of 157805207 is 702508751.

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

It is an interprime number because it is at equal distance from previous prime (157805201) and next prime (157805213).

It is a cyclic number.

It is not a de Polignac number, because 157805207 - 2⁶ = 157805143 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 (157805201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11271794 + ... + 11271807.

It is an arithmetic number, because the mean of its divisors is an integer number (45087204).

Almost surely, 2^157805207 is an apocalyptic number.

157805207 is a deficient number, since it is larger than the sum of its proper divisors (22543609).

157805207 is an equidigital number, since it uses as much as digits as its factorization.

157805207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22543608.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 157805207 is about 12562.0542507983. The cubic root of 157805207 is about 540.3897586233.

The spelling of 157805207 in words is "one hundred fifty-seven million, eight hundred five thousand, two hundred seven".