1629945 has 24 divisors (see below), whose sum is σ = 2925000. Its totient is φ = 838656.

The previous prime is 1629937. The next prime is 1629983. The reversal of 1629945 is 5499261.

It can be written as a sum of positive squares in 4 ways, for example, as 131769 + 1498176 = 363^2 + 1224^2 .

It is not a de Polignac number, because 1629945 - 2³ = 1629937 is a prime.

It is a Curzon number.

1629945 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681 + ... + 1929.

It is an arithmetic number, because the mean of its divisors is an integer number (121875).

2^1629945 is an apocalyptic number.

1629945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1629945 is a deficient number, since it is larger than the sum of its proper divisors (1295055).

1629945 is a wasteful number, since it uses less digits than its factorization.

1629945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1286 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 1629945 is about 1276.6929936363. The cubic root of 1629945 is about 117.6858684950.

The spelling of 1629945 in words is "one million, six hundred twenty-nine thousand, nine hundred forty-five".