1540371243 has 4 divisors (see below), whose sum is σ = 2053828328. Its totient is φ = 1026914160.

The previous prime is 1540371197. The next prime is 1540371253. The reversal of 1540371243 is 3421730451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3421730451 = 3 ⋅1140576817.

It is not a de Polignac number, because 1540371243 - 2⁸ = 1540370987 is a prime.

It is a super-2 number, since 2×1540371243² = 4745487132522730098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1540371243.

It is not an unprimeable number, because it can be changed into a prime (1540371253) 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, 256728538 + ... + 256728543.

It is an arithmetic number, because the mean of its divisors is an integer number (513457082).

Almost surely, 2^1540371243 is an apocalyptic number.

1540371243 is a deficient number, since it is larger than the sum of its proper divisors (513457085).

1540371243 is an equidigital number, since it uses as much as digits as its factorization.

1540371243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513457084.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 1540371243 is about 39247.5635294728. The cubic root of 1540371243 is about 1154.8931375430.

The spelling of 1540371243 in words is "one billion, five hundred forty million, three hundred seventy-one thousand, two hundred forty-three".