1540263401 has 4 divisors (see below), whose sum is σ = 1544460672. Its totient is φ = 1536066132.

The previous prime is 1540263391. The next prime is 1540263409. The reversal of 1540263401 is 1043620451.

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: 1043620451 = 10141 ⋅102911.

It is a cyclic number.

It is not a de Polignac number, because 1540263401 - 2¹⁰ = 1540262377 is a prime.

It is a super-2 number, since 2×1540263401² = 4744822688920173602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540263409) 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, 2098085 + ... + 2098818.

It is an arithmetic number, because the mean of its divisors is an integer number (386115168).

Almost surely, 2^1540263401 is an apocalyptic number.

It is an amenable number.

1540263401 is a deficient number, since it is larger than the sum of its proper divisors (4197271).

1540263401 is an equidigital number, since it uses as much as digits as its factorization.

1540263401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197270.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1540263401 is about 39246.1896367023. The cubic root of 1540263401 is about 1154.8661854055.

Adding to 1540263401 its reverse (1043620451), we get a palindrome (2583883852).

The spelling of 1540263401 in words is "one billion, five hundred forty million, two hundred sixty-three thousand, four hundred one".