137405809 has 8 divisors (see below), whose sum is σ = 138710880. Its totient is φ = 136105536.

The previous prime is 137405797. The next prime is 137405819. The reversal of 137405809 is 908504731.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137405809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137405819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81594 + ... + 83260.

It is an arithmetic number, because the mean of its divisors is an integer number (17338860).

Almost surely, 2^137405809 is an apocalyptic number.

It is an amenable number.

137405809 is a deficient number, since it is larger than the sum of its proper divisors (1305071).

137405809 is a wasteful number, since it uses less digits than its factorization.

137405809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 137405809 is about 11722.0223937681. The cubic root of 137405809 is about 516.0221744472.

The spelling of 137405809 in words is "one hundred thirty-seven million, four hundred five thousand, eight hundred nine".