1945000 has 40 divisors (see below), whose sum is σ = 4568850. Its totient is φ = 776000.

The previous prime is 1944997. The next prime is 1945003. The reversal of 1945000 is 5491.

It is an interprime number because it is at equal distance from previous prime (1944997) and next prime (1945003).

It can be written as a sum of positive squares in 5 ways, for example, as 1764 + 1943236 = 42^2 + 1394^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (1945003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4806 + ... + 5194.

2^1945000 is an apocalyptic number.

1945000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1945000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284425).

1945000 is an abundant number, since it is smaller than the sum of its proper divisors (2623850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1945000 is an equidigital number, since it uses as much as digits as its factorization.

1945000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1945000 is about 1394.6325680981. The cubic root of 1945000 is about 124.8264257541.

The spelling of 1945000 in words is "one million, nine hundred forty-five thousand".