1945890 has 32 divisors (see below), whose sum is σ = 5189760. Its totient is φ = 518832.

The previous prime is 1945883. The next prime is 1945891. The reversal of 1945890 is 985491.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1945891) 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, 3334 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (162180).

2^1945890 is an apocalyptic number.

1945890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1945890 is an abundant number, since it is smaller than the sum of its proper divisors (3243870).

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

1945890 is a wasteful number, since it uses less digits than its factorization.

1945890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223 (or 7217 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1945890 is about 1394.9516120640. The cubic root of 1945890 is about 124.8454623570.

It can be divided in two parts, 194 and 5890, that added together give a square (6084 = 78²).

The spelling of 1945890 in words is "one million, nine hundred forty-five thousand, eight hundred ninety".