1890311438 has 4 divisors (see below), whose sum is σ = 2835467160. Its totient is φ = 945155718.

The previous prime is 1890311429. The next prime is 1890311461. The reversal of 1890311438 is 8341130981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8341130981 = 2237 ⋅3728713.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472577858 + ... + 472577861.

It is an arithmetic number, because the mean of its divisors is an integer number (708866790).

Almost surely, 2^1890311438 is an apocalyptic number.

1890311438 is a deficient number, since it is larger than the sum of its proper divisors (945155722).

1890311438 is an equidigital number, since it uses as much as digits as its factorization.

1890311438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945155721.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1890311438 is about 43477.7119683177. The cubic root of 1890311438 is about 1236.4534975805.

The spelling of 1890311438 in words is "one billion, eight hundred ninety million, three hundred eleven thousand, four hundred thirty-eight".