1945947 has 4 divisors (see below), whose sum is σ = 2594600. Its totient is φ = 1297296.

The previous prime is 1945943. The next prime is 1945969. The reversal of 1945947 is 7495491.

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

It is not a de Polignac number, because 1945947 - 2² = 1945943 is a prime.

It is a D-number.

It is a Duffinian number.

1945947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1945943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324322 + ... + 324327.

It is an arithmetic number, because the mean of its divisors is an integer number (648650).

2^1945947 is an apocalyptic number.

1945947 is a deficient number, since it is larger than the sum of its proper divisors (648653).

1945947 is an equidigital number, since it uses as much as digits as its factorization.

1945947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648652.

The product of its digits is 45360, while the sum is 39.

The square root of 1945947 is about 1394.9720427306. The cubic root of 1945947 is about 124.8466813574.

The spelling of 1945947 in words is "one million, nine hundred forty-five thousand, nine hundred forty-seven".