39428405 has 4 divisors (see below), whose sum is σ = 47314092. Its totient is φ = 31542720.

The previous prime is 39428399. The next prime is 39428419. The reversal of 39428405 is 50482493.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11792356 + 27636049 = 3434^2 + 5257^2 .

It is not a de Polignac number, because 39428405 - 2⁶ = 39428341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3942836 + ... + 3942845.

It is an arithmetic number, because the mean of its divisors is an integer number (11828523).

Almost surely, 2^39428405 is an apocalyptic number.

It is an amenable number.

39428405 is a deficient number, since it is larger than the sum of its proper divisors (7885687).

39428405 is an equidigital number, since it uses as much as digits as its factorization.

39428405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7885686.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 39428405 is about 6279.2041693195. The cubic root of 39428405 is about 340.3583447946.

The spelling of 39428405 in words is "thirty-nine million, four hundred twenty-eight thousand, four hundred five".