1820769638 has 8 divisors (see below), whose sum is σ = 2733376800. Its totient is φ = 909644040.

The previous prime is 1820769623. The next prime is 1820769641. The reversal of 1820769638 is 8369670281.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 367313 + ... + 372236.

It is an arithmetic number, because the mean of its divisors is an integer number (341672100).

Almost surely, 2^1820769638 is an apocalyptic number.

1820769638 is a deficient number, since it is larger than the sum of its proper divisors (912607162).

1820769638 is a wasteful number, since it uses less digits than its factorization.

1820769638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740782.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 1820769638 is about 42670.4773584735. The cubic root of 1820769638 is about 1221.1012268611.

The spelling of 1820769638 in words is "one billion, eight hundred twenty million, seven hundred sixty-nine thousand, six hundred thirty-eight".