1881898 has 4 divisors (see below), whose sum is σ = 2822850. Its totient is φ = 940948.

The previous prime is 1881889. The next prime is 1881899. The reversal of 1881898 is 8981881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8981881 = 1087 ⋅8263.

It can be written as a sum of positive squares in only one way, i.e., 954529 + 927369 = 977^2 + 963^2 .

It is not an unprimeable number, because it can be changed into a prime (1881899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470473 + ... + 470476.

2^1881898 is an apocalyptic number.

1881898 is a deficient number, since it is larger than the sum of its proper divisors (940952).

1881898 is an equidigital number, since it uses as much as digits as its factorization.

1881898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940951.

The product of its digits is 36864, while the sum is 43.

The square root of 1881898 is about 1371.8228748640. The cubic root of 1881898 is about 123.4616358188.

It can be divided in two parts, 18818 and 98, that multiplied together give a square (1844164 = 1358²).

The spelling of 1881898 in words is "one million, eight hundred eighty-one thousand, eight hundred ninety-eight".