1540989469 has 8 divisors (see below), whose sum is σ = 1608361272. Its totient is φ = 1475036160.

The previous prime is 1540989451. The next prime is 1540989479. The reversal of 1540989469 is 9649890451.

It can be written as a sum of positive squares in 4 ways, for example, as 99800100 + 1441189369 = 9990^2 + 37963^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1540989469 - 2⁹ = 1540988957 is a prime.

It is a super-2 number, since 2×1540989469² = 4749297087137803922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540989419) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 352404 + ... + 356749.

It is an arithmetic number, because the mean of its divisors is an integer number (201045159).

Almost surely, 2^1540989469 is an apocalyptic number.

It is an amenable number.

1540989469 is a deficient number, since it is larger than the sum of its proper divisors (67371803).

1540989469 is an equidigital number, since it uses as much as digits as its factorization.

1540989469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709247.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 1540989469 is about 39255.4387187304. The cubic root of 1540989469 is about 1155.0476218316.

The spelling of 1540989469 in words is "one billion, five hundred forty million, nine hundred eighty-nine thousand, four hundred sixty-nine".