137405217 has 8 divisors (see below), whose sum is σ = 183534624. Its totient is φ = 91439648.

The previous prime is 137405201. The next prime is 137405221. The reversal of 137405217 is 712504731.

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

It is a cyclic number.

It is not a de Polignac number, because 137405217 - 2⁴ = 137405201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137405287) 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, 38988 + ... + 42365.

It is an arithmetic number, because the mean of its divisors is an integer number (22941828).

Almost surely, 2^137405217 is an apocalyptic number.

It is an amenable number.

137405217 is a deficient number, since it is larger than the sum of its proper divisors (46129407).

137405217 is an equidigital number, since it uses as much as digits as its factorization.

137405217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81919.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 137405217 is about 11721.9971421256. The cubic root of 137405217 is about 516.0214333685.

Adding to 137405217 its reverse (712504731), we get a palindrome (849909948).

The spelling of 137405217 in words is "one hundred thirty-seven million, four hundred five thousand, two hundred seventeen".