1540429481 has 4 divisors (see below), whose sum is σ = 1540827264. Its totient is φ = 1540031700.

The previous prime is 1540429441. The next prime is 1540429487. The reversal of 1540429481 is 1849240451.

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: 1849240451 = 33083 ⋅55897.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540429481 is a prime.

It is a super-2 number, since 2×1540429481² = 4745845971867858722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540429487) 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, 193025 + ... + 200846.

It is an arithmetic number, because the mean of its divisors is an integer number (385206816).

Almost surely, 2^1540429481 is an apocalyptic number.

It is an amenable number.

1540429481 is a deficient number, since it is larger than the sum of its proper divisors (397783).

1540429481 is an equidigital number, since it uses as much as digits as its factorization.

1540429481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397782.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 1540429481 is about 39248.3054538664. The cubic root of 1540429481 is about 1154.9076920039.

The spelling of 1540429481 in words is "one billion, five hundred forty million, four hundred twenty-nine thousand, four hundred eighty-one".