139474973 has 4 divisors (see below), whose sum is σ = 152154528. Its totient is φ = 126795420.

The previous prime is 139474957. The next prime is 139474981. The reversal of 139474973 is 379474931.

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: 379474931 = 11 ⋅34497721.

It is a cyclic number.

It is not a de Polignac number, because 139474973 - 2⁴ = 139474957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139474073) 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, 6339761 + ... + 6339782.

It is an arithmetic number, because the mean of its divisors is an integer number (38038632).

Almost surely, 2^139474973 is an apocalyptic number.

It is an amenable number.

139474973 is a deficient number, since it is larger than the sum of its proper divisors (12679555).

139474973 is a wasteful number, since it uses less digits than its factorization.

139474973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12679554.

The product of its digits is 571536, while the sum is 47.

The square root of 139474973 is about 11809.9522861018. The cubic root of 139474973 is about 518.5995019366.

It can be divided in two parts, 1394 and 74973, that added together give a palindrome (76367).

The spelling of 139474973 in words is "one hundred thirty-nine million, four hundred seventy-four thousand, nine hundred seventy-three".