137929821 has 8 divisors (see below), whose sum is σ = 188877024. Its totient is φ = 89467920.

The previous prime is 137929811. The next prime is 137929837. The reversal of 137929821 is 128929731.

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

It is not a de Polignac number, because 137929821 - 2¹⁹ = 137405533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137929811) 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, 621195 + ... + 621416.

It is an arithmetic number, because the mean of its divisors is an integer number (23609628).

Almost surely, 2^137929821 is an apocalyptic number.

It is an amenable number.

137929821 is a deficient number, since it is larger than the sum of its proper divisors (50947203).

137929821 is a wasteful number, since it uses less digits than its factorization.

137929821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242651.

The product of its digits is 54432, while the sum is 42.

The square root of 137929821 is about 11744.3527280136. The cubic root of 137929821 is about 516.6773112387.

The spelling of 137929821 in words is "one hundred thirty-seven million, nine hundred twenty-nine thousand, eight hundred twenty-one".