39278973 has 4 divisors (see below), whose sum is σ = 52371968. Its totient is φ = 26185980.

The previous prime is 39278971. The next prime is 39278977. The reversal of 39278973 is 37987293.

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: 37987293 = 3 ⋅12662431.

It is not a de Polignac number, because 39278973 - 2¹ = 39278971 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 (39278971) 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, 6546493 + ... + 6546498.

It is an arithmetic number, because the mean of its divisors is an integer number (13092992).

Almost surely, 2^39278973 is an apocalyptic number.

It is an amenable number.

39278973 is a deficient number, since it is larger than the sum of its proper divisors (13092995).

39278973 is a wasteful number, since it uses less digits than its factorization.

39278973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13092994.

The product of its digits is 571536, while the sum is 48.

The square root of 39278973 is about 6267.2939136441. The cubic root of 39278973 is about 339.9278191641.

The spelling of 39278973 in words is "thirty-nine million, two hundred seventy-eight thousand, nine hundred seventy-three".