3972405 has 8 divisors (see below), whose sum is σ = 6355872. Its totient is φ = 2118608.

The previous prime is 3972377. The next prime is 3972413. The reversal of 3972405 is 5042793.

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

It is a cyclic number.

It is not a de Polignac number, because 3972405 - 2⁶ = 3972341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132399 + ... + 132428.

It is an arithmetic number, because the mean of its divisors is an integer number (794484).

Almost surely, 2^3972405 is an apocalyptic number.

It is an amenable number.

3972405 is a deficient number, since it is larger than the sum of its proper divisors (2383467).

3972405 is a wasteful number, since it uses less digits than its factorization.

3972405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264835.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 3972405 is about 1993.0893105930. The cubic root of 3972405 is about 158.3742264335.

The spelling of 3972405 in words is "three million, nine hundred seventy-two thousand, four hundred five".