1899242 has 4 divisors (see below), whose sum is σ = 2848866. Its totient is φ = 949620.

The previous prime is 1899199. The next prime is 1899253. The reversal of 1899242 is 2429981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2429981 = 631 ⋅3851.

It can be written as a sum of positive squares in only one way, i.e., 1713481 + 185761 = 1309^2 + 431^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 474809 + ... + 474812.

2^1899242 is an apocalyptic number.

1899242 is a deficient number, since it is larger than the sum of its proper divisors (949624).

1899242 is an equidigital number, since it uses as much as digits as its factorization.

1899242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949623.

The product of its digits is 10368, while the sum is 35.

The square root of 1899242 is about 1378.1298922816. The cubic root of 1899242 is about 123.8397600661.

The spelling of 1899242 in words is "one million, eight hundred ninety-nine thousand, two hundred forty-two".