1491806 has 4 divisors (see below), whose sum is σ = 2237712. Its totient is φ = 745902.

The previous prime is 1491797. The next prime is 1491821. The reversal of 1491806 is 6081941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6081941 = 47 ⋅129403.

It is an Ulam 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, 372950 + ... + 372953.

It is an arithmetic number, because the mean of its divisors is an integer number (559428).

2^1491806 is an apocalyptic number.

1491806 is a deficient number, since it is larger than the sum of its proper divisors (745906).

1491806 is an equidigital number, since it uses as much as digits as its factorization.

1491806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745905.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1491806 is about 1221.3951039692. The cubic root of 1491806 is about 114.2626038091.

The spelling of 1491806 in words is "one million, four hundred ninety-one thousand, eight hundred six".