137878973 has 4 divisors (see below), whose sum is σ = 137916768. Its totient is φ = 137841180.

The previous prime is 137878933. The next prime is 137878981. The reversal of 137878973 is 379878731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379878731 = 1901 ⋅199831.

It is a cyclic number.

It is not a de Polignac number, because 137878973 - 2¹⁴ = 137862589 is a prime.

It is a super-2 number, since 2×137878973² = 38021222391069458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137878913) 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, 12761 + ... + 20942.

It is an arithmetic number, because the mean of its divisors is an integer number (34479192).

Almost surely, 2^137878973 is an apocalyptic number.

It is an amenable number.

137878973 is a deficient number, since it is larger than the sum of its proper divisors (37795).

137878973 is an equidigital number, since it uses as much as digits as its factorization.

137878973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37794.

The product of its digits is 1778112, while the sum is 53.

The square root of 137878973 is about 11742.1877433466. The cubic root of 137878973 is about 516.6138121906.

The spelling of 137878973 in words is "one hundred thirty-seven million, eight hundred seventy-eight thousand, nine hundred seventy-three".