137999845 has 8 divisors (see below), whose sum is σ = 165663864. Its totient is φ = 110357184.

The previous prime is 137999843. The next prime is 137999881. The reversal of 137999845 is 548999731.

It can be written as a sum of positive squares in 4 ways, for example, as 47692836 + 90307009 = 6906^2 + 9503^2 .

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 137999845 - 2¹ = 137999843 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 (137999843) 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, 18847 + ... + 25123.

It is an arithmetic number, because the mean of its divisors is an integer number (20707983).

Almost surely, 2^137999845 is an apocalyptic number.

It is an amenable number.

137999845 is a deficient number, since it is larger than the sum of its proper divisors (27664019).

137999845 is an equidigital number, since it uses as much as digits as its factorization.

137999845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10679.

The product of its digits is 2449440, while the sum is 55.

The square root of 137999845 is about 11747.3335272308. Note that the first 3 decimals coincide. The cubic root of 137999845 is about 516.7647317615.

The spelling of 137999845 in words is "one hundred thirty-seven million, nine hundred ninety-nine thousand, eight hundred forty-five".