3992405 has 4 divisors (see below), whose sum is σ = 4790892. Its totient is φ = 3193920.

The previous prime is 3992393. The next prime is 3992407. The reversal of 3992405 is 5042993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5042993 = 619 ⋅8147.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 3363556 = 793^2 + 1834^2 .

It is not a de Polignac number, because 3992405 - 2⁶ = 3992341 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 (3992407) 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, 399236 + ... + 399245.

It is an arithmetic number, because the mean of its divisors is an integer number (1197723).

Almost surely, 2^3992405 is an apocalyptic number.

It is an amenable number.

3992405 is a deficient number, since it is larger than the sum of its proper divisors (798487).

3992405 is an equidigital number, since it uses as much as digits as its factorization.

3992405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798486.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 3992405 is about 1998.1003478304. The cubic root of 3992405 is about 158.6395722827.

The spelling of 3992405 in words is "three million, nine hundred ninety-two thousand, four hundred five".