39428391 has 4 divisors (see below), whose sum is σ = 52571192. Its totient is φ = 26285592.

The previous prime is 39428369. The next prime is 39428393. The reversal of 39428391 is 19382493.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 39428391 - 2⁶ = 39428327 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 (39428393) 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, 6571396 + ... + 6571401.

It is an arithmetic number, because the mean of its divisors is an integer number (13142798).

Almost surely, 2^39428391 is an apocalyptic number.

39428391 is a deficient number, since it is larger than the sum of its proper divisors (13142801).

39428391 is a wasteful number, since it uses less digits than its factorization.

39428391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13142800.

The product of its digits is 46656, while the sum is 39.

The square root of 39428391 is about 6279.2030545285. The cubic root of 39428391 is about 340.3583045105.

The spelling of 39428391 in words is "thirty-nine million, four hundred twenty-eight thousand, three hundred ninety-one".