1540885469 has 4 divisors (see below), whose sum is σ = 1542336096. Its totient is φ = 1539434844.

The previous prime is 1540885447. The next prime is 1540885471. The reversal of 1540885469 is 9645880451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9645880451 = 367 ⋅26283053.

It is a cyclic number.

It is not a de Polignac number, because 1540885469 - 2¹² = 1540881373 is a prime.

It is a super-2 number, since 2×1540885469² = 4748656057150699922, 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 (1540885439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723719 + ... + 725844.

It is an arithmetic number, because the mean of its divisors is an integer number (385584024).

Almost surely, 2^1540885469 is an apocalyptic number.

It is an amenable number.

1540885469 is a deficient number, since it is larger than the sum of its proper divisors (1450627).

1540885469 is a wasteful number, since it uses less digits than its factorization.

1540885469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450626.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The square root of 1540885469 is about 39254.1140391679. The cubic root of 1540885469 is about 1155.0216368703.

The spelling of 1540885469 in words is "one billion, five hundred forty million, eight hundred eighty-five thousand, four hundred sixty-nine".