1540398043 has 2 divisors, whose sum is σ = 1540398044. Its totient is φ = 1540398042.

The previous prime is 1540398007. The next prime is 1540398049. The reversal of 1540398043 is 3408930451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1540398043 - 2²¹ = 1538300891 is a prime.

It is a super-2 number, since 2×1540398043² = 4745652261756459698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1540397993 and 1540398011.

It is not a weakly prime, because it can be changed into another prime (1540398049) 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 as a sum of consecutive naturals, namely, 770199021 + 770199022.

It is an arithmetic number, because the mean of its divisors is an integer number (770199022).

Almost surely, 2^1540398043 is an apocalyptic number.

1540398043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540398043 is an equidigital number, since it uses as much as digits as its factorization.

1540398043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1540398043 is about 39247.9049504556. The cubic root of 1540398043 is about 1154.8998352696.

The spelling of 1540398043 in words is "one billion, five hundred forty million, three hundred ninety-eight thousand, forty-three".