1993406 has 4 divisors (see below), whose sum is σ = 2990112. Its totient is φ = 996702.

The previous prime is 1993367. The next prime is 1993417. The reversal of 1993406 is 6043991.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498350 + ... + 498353.

It is an arithmetic number, because the mean of its divisors is an integer number (747528).

2^1993406 is an apocalyptic number.

1993406 is a deficient number, since it is larger than the sum of its proper divisors (996706).

1993406 is an equidigital number, since it uses as much as digits as its factorization.

1993406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996705.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1993406 is about 1411.8803065416. The cubic root of 1993406 is about 125.8534872134.

The spelling of 1993406 in words is "one million, nine hundred ninety-three thousand, four hundred six".