1656406 has 8 divisors (see below), whose sum is σ = 2500344. Its totient is φ = 822960.

The previous prime is 1656383. The next prime is 1656427. The reversal of 1656406 is 6046561.

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, 2215 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (312543).

2^1656406 is an apocalyptic number.

1656406 is a deficient number, since it is larger than the sum of its proper divisors (843938).

1656406 is a wasteful number, since it uses less digits than its factorization.

1656406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1656406 is about 1287.0143744341. The cubic root of 1656406 is about 118.3193018254.

It can be divided in two parts, 16 and 56406, that multiplied together give a triangular number (902496 = T₁₃₄₃).

The spelling of 1656406 in words is "one million, six hundred fifty-six thousand, four hundred six".