137520406 has 4 divisors (see below), whose sum is σ = 206280612. Its totient is φ = 68760202.

The previous prime is 137520401. The next prime is 137520431. The reversal of 137520406 is 604025731.

137520406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137520401) 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 as a sum of consecutive naturals, namely, 34380100 + ... + 34380103.

It is an arithmetic number, because the mean of its divisors is an integer number (51570153).

Almost surely, 2^137520406 is an apocalyptic number.

137520406 is a deficient number, since it is larger than the sum of its proper divisors (68760206).

137520406 is an equidigital number, since it uses as much as digits as its factorization.

137520406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68760205.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 137520406 is about 11726.9094820417. The cubic root of 137520406 is about 516.1655894446.

The spelling of 137520406 in words is "one hundred thirty-seven million, five hundred twenty thousand, four hundred six".