1439661890 has 8 divisors (see below), whose sum is σ = 2591391420. Its totient is φ = 575864752.

The previous prime is 1439661869. The next prime is 1439661893. The reversal of 1439661890 is 981669341.

It can be written as a sum of positive squares in 2 ways, for example, as 1437092281 + 2569609 = 37909^2 + 1603^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1439661893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71983085 + ... + 71983104.

Almost surely, 2^1439661890 is an apocalyptic number.

1439661890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1439661890 is a deficient number, since it is larger than the sum of its proper divisors (1151729530).

1439661890 is a wasteful number, since it uses less digits than its factorization.

1439661890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143966196.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1439661890 is about 37942.8766700681. The cubic root of 1439661890 is about 1129.1548461580.

The spelling of 1439661890 in words is "one billion, four hundred thirty-nine million, six hundred sixty-one thousand, eight hundred ninety".