39673921 has 4 divisors (see below), whose sum is σ = 45341632. Its totient is φ = 34006212.

The previous prime is 39673913. The next prime is 39673927. The reversal of 39673921 is 12937693.

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: 12937693 = 1289 ⋅10037.

It is a cyclic number.

It is not a de Polignac number, because 39673921 - 2³ = 39673913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39673927) 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, 2833845 + ... + 2833858.

It is an arithmetic number, because the mean of its divisors is an integer number (11335408).

Almost surely, 2^39673921 is an apocalyptic number.

It is an amenable number.

39673921 is a deficient number, since it is larger than the sum of its proper divisors (5667711).

39673921 is an equidigital number, since it uses as much as digits as its factorization.

39673921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667710.

The product of its digits is 61236, while the sum is 40.

The square root of 39673921 is about 6298.7237596199. The cubic root of 39673921 is about 341.0633405155.

The spelling of 39673921 in words is "thirty-nine million, six hundred seventy-three thousand, nine hundred twenty-one".