1864393442 has 4 divisors (see below), whose sum is σ = 2796590166. Its totient is φ = 932196720.

The previous prime is 1864393423. The next prime is 1864393459. The reversal of 1864393442 is 2443934681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1857523801 + 6869641 = 43099^2 + 2621^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1864393393 and 1864393402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466098359 + ... + 466098362.

Almost surely, 2^1864393442 is an apocalyptic number.

1864393442 is a deficient number, since it is larger than the sum of its proper divisors (932196724).

1864393442 is an equidigital number, since it uses as much as digits as its factorization.

1864393442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932196723.

The product of its digits is 497664, while the sum is 44.

The square root of 1864393442 is about 43178.6225116087. The cubic root of 1864393442 is about 1230.7764815352.

The spelling of 1864393442 in words is "one billion, eight hundred sixty-four million, three hundred ninety-three thousand, four hundred forty-two".