137821387 has 8 divisors (see below), whose sum is σ = 152816112. Its totient is φ = 123237600.

The previous prime is 137821379. The next prime is 137821391. The reversal of 137821387 is 783128731.

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

It is a cyclic number.

It is not a de Polignac number, because 137821387 - 2³ = 137821379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137821357) 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, 102028 + ... + 103369.

It is an arithmetic number, because the mean of its divisors is an integer number (19102014).

Almost surely, 2^137821387 is an apocalyptic number.

137821387 is a deficient number, since it is larger than the sum of its proper divisors (14994725).

137821387 is a wasteful number, since it uses less digits than its factorization.

137821387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205469.

The product of its digits is 56448, while the sum is 40.

The square root of 137821387 is about 11739.7353888408. The cubic root of 137821387 is about 516.5418798647.

The spelling of 137821387 in words is "one hundred thirty-seven million, eight hundred twenty-one thousand, three hundred eighty-seven".