137999945 has 8 divisors (see below), whose sum is σ = 174315840. Its totient is φ = 104589360.

The previous prime is 137999923. The next prime is 137999987. The reversal of 137999945 is 549999731.

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

It is not a de Polignac number, because 137999945 - 2⁶ = 137999881 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726221 + ... + 726410.

It is an arithmetic number, because the mean of its divisors is an integer number (21789480).

Almost surely, 2^137999945 is an apocalyptic number.

It is an amenable number.

137999945 is a deficient number, since it is larger than the sum of its proper divisors (36315895).

137999945 is a wasteful number, since it uses less digits than its factorization.

137999945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452655.

The product of its digits is 2755620, while the sum is 56.

The square root of 137999945 is about 11747.3377835150. The cubic root of 137999945 is about 516.7648565840.

The spelling of 137999945 in words is "one hundred thirty-seven million, nine hundred ninety-nine thousand, nine hundred forty-five".