1391973 has 8 divisors (see below), whose sum is σ = 2024736. Its totient is φ = 843600.

The previous prime is 1391969. The next prime is 1391981. The reversal of 1391973 is 3791931.

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

It is not a de Polignac number, because 1391973 - 2² = 1391969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 42181 = 1391973 / (1 + 3 + 9 + 1 + 9 + 7 + 3).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21058 + ... + 21123.

It is an arithmetic number, because the mean of its divisors is an integer number (253092).

2^1391973 is an apocalyptic number.

It is an amenable number.

1391973 is a deficient number, since it is larger than the sum of its proper divisors (632763).

1391973 is a wasteful number, since it uses less digits than its factorization.

1391973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42195.

The product of its digits is 5103, while the sum is 33.

The square root of 1391973 is about 1179.8190539231. The cubic root of 1391973 is about 111.6546815186.

It can be divided in two parts, 139 and 1973, that added together give a palindrome (2112).

The spelling of 1391973 in words is "one million, three hundred ninety-one thousand, nine hundred seventy-three".