137981439 has 24 divisors (see below), whose sum is σ = 218924160. Its totient is φ = 83354832.

The previous prime is 137981423. The next prime is 137981483. The reversal of 137981439 is 934189731.

137981439 is a `hidden beast` number, since 137 + 9 + 81 + 439 = 666.

It is not a de Polignac number, because 137981439 - 2⁴ = 137981423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137981394 and 137981403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137981489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13609 + ... + 21474.

It is an arithmetic number, because the mean of its divisors is an integer number (9121840).

Almost surely, 2^137981439 is an apocalyptic number.

137981439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

137981439 is a deficient number, since it is larger than the sum of its proper divisors (80942721).

137981439 is a wasteful number, since it uses less digits than its factorization.

137981439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35131 (or 35128 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 137981439 is about 11746.5500892815. The cubic root of 137981439 is about 516.7417559034.

The spelling of 137981439 in words is "one hundred thirty-seven million, nine hundred eighty-one thousand, four hundred thirty-nine".