137721308 has 12 divisors (see below), whose sum is σ = 242492040. Its totient is φ = 68437872.

The previous prime is 137721307. The next prime is 137721341. The reversal of 137721308 is 803127731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137721307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104963 + ... + 106266.

It is an arithmetic number, because the mean of its divisors is an integer number (20207670).

Almost surely, 2^137721308 is an apocalyptic number.

It is an amenable number.

137721308 is a deficient number, since it is larger than the sum of its proper divisors (104770732).

137721308 is a wasteful number, since it uses less digits than its factorization.

137721308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211396 (or 211394 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 137721308 is about 11735.4722103544. The cubic root of 137721308 is about 516.4168206274.

The spelling of 137721308 in words is "one hundred thirty-seven million, seven hundred twenty-one thousand, three hundred eight".