3942405 has 64 divisors (see below), whose sum is σ = 7776000. Its totient is φ = 1886976.

The previous prime is 3942403. The next prime is 3942409. The reversal of 3942405 is 5042493.

It is not a de Polignac number, because 3942405 - 2¹ = 3942403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74359 + ... + 74411.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

Almost surely, 2^3942405 is an apocalyptic number.

It is an amenable number.

3942405 is a deficient number, since it is larger than the sum of its proper divisors (3833595).

3942405 is a wasteful number, since it uses less digits than its factorization.

3942405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 3942405 is about 1985.5490424565. The cubic root of 3942405 is about 157.9745325614.

Adding to 3942405 its reverse (5042493), we get a palindrome (8984898).

The spelling of 3942405 in words is "three million, nine hundred forty-two thousand, four hundred five".