1947945 has 16 divisors (see below), whose sum is σ = 3300480. Its totient is φ = 977664.

The previous prime is 1947941. The next prime is 1947971. The reversal of 1947945 is 5497491.

It is not a de Polignac number, because 1947945 - 2² = 1947941 is a prime.

It is a Curzon number.

1947945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1947941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3565 + ... + 4074.

It is an arithmetic number, because the mean of its divisors is an integer number (206280).

2^1947945 is an apocalyptic number.

1947945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1947945 is a deficient number, since it is larger than the sum of its proper divisors (1352535).

1947945 is a wasteful number, since it uses less digits than its factorization.

1947945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7664.

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

The square root of 1947945 is about 1395.6880023845. The cubic root of 1947945 is about 124.8893954953.

The spelling of 1947945 in words is "one million, nine hundred forty-seven thousand, nine hundred forty-five".