819741490 has 8 divisors (see below), whose sum is σ = 1475534700. Its totient is φ = 327896592.

The previous prime is 819741473. The next prime is 819741499. The reversal of 819741490 is 94147918.

It can be written as a sum of positive squares in 2 ways, for example, as 817216569 + 2524921 = 28587^2 + 1589^2 .

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

It is a super-2 number, since 2×819741490² = 1343952220854840200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (819741499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40987065 + ... + 40987084.

Almost surely, 2^819741490 is an apocalyptic number.

819741490 is a deficient number, since it is larger than the sum of its proper divisors (655793210).

819741490 is a wasteful number, since it uses less digits than its factorization.

819741490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81974156.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 819741490 is about 28631.1279903534. The cubic root of 819741490 is about 935.8917931076.

The spelling of 819741490 in words is "eight hundred nineteen million, seven hundred forty-one thousand, four hundred ninety".