137720805 has 8 divisors (see below), whose sum is σ = 220353312. Its totient is φ = 73451088.

The previous prime is 137720801. The next prime is 137720813. The reversal of 137720805 is 508027731.

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

It is not a de Polignac number, because 137720805 - 2² = 137720801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137720801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4590679 + ... + 4590708.

It is an arithmetic number, because the mean of its divisors is an integer number (27544164).

Almost surely, 2^137720805 is an apocalyptic number.

137720805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

137720805 is a deficient number, since it is larger than the sum of its proper divisors (82632507).

137720805 is an equidigital number, since it uses as much as digits as its factorization.

137720805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181395.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 137720805 is about 11735.4507795824. The cubic root of 137720805 is about 516.4161919230.

The spelling of 137720805 in words is "one hundred thirty-seven million, seven hundred twenty thousand, eight hundred five".