3940406 has 8 divisors (see below), whose sum is σ = 6167664. Its totient is φ = 1884520.

The previous prime is 3940397. The next prime is 3940411. The reversal of 3940406 is 6040493.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 42785 + ... + 42876.

It is an arithmetic number, because the mean of its divisors is an integer number (770958).

Almost surely, 2^3940406 is an apocalyptic number.

3940406 is a deficient number, since it is larger than the sum of its proper divisors (2227258).

3940406 is a wasteful number, since it uses less digits than its factorization.

3940406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85686.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 3940406 is about 1985.0455914160. The cubic root of 3940406 is about 157.9478276710.

Adding to 3940406 its reverse (6040493), we get a palindrome (9980899).

The spelling of 3940406 in words is "three million, nine hundred forty thousand, four hundred six".