1491973 has 4 divisors (see below), whose sum is σ = 1705120. Its totient is φ = 1278828.

The previous prime is 1491967. The next prime is 1491977. The reversal of 1491973 is 3791941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106563 + ... + 106576.

It is an arithmetic number, because the mean of its divisors is an integer number (426280).

2^1491973 is an apocalyptic number.

It is an amenable number.

1491973 is a deficient number, since it is larger than the sum of its proper divisors (213147).

1491973 is an equidigital number, since it uses as much as digits as its factorization.

1491973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213146.

The product of its digits is 6804, while the sum is 34.

The square root of 1491973 is about 1221.4634665024. The cubic root of 1491973 is about 114.2668673534.

Subtracting 1491973 from its reverse (3791941), we obtain a cube (2299968 = 132³).

The spelling of 1491973 in words is "one million, four hundred ninety-one thousand, nine hundred seventy-three".