1903994 has 4 divisors (see below), whose sum is σ = 2855994. Its totient is φ = 951996.

The previous prime is 1903991. The next prime is 1904011. The reversal of 1903994 is 4993091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4993091 = 461 ⋅10831.

It can be written as a sum of positive squares in only one way, i.e., 1857769 + 46225 = 1363^2 + 215^2 .

It is not an unprimeable number, because it can be changed into a prime (1903991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475997 + ... + 476000.

2^1903994 is an apocalyptic number.

1903994 is a deficient number, since it is larger than the sum of its proper divisors (952000).

1903994 is an equidigital number, since it uses as much as digits as its factorization.

1903994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951999.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1903994 is about 1379.8528907097. The cubic root of 1903994 is about 123.9429585024.

The spelling of 1903994 in words is "one million, nine hundred three thousand, nine hundred ninety-four".