1540572023 has 4 divisors (see below), whose sum is σ = 1540717200. Its totient is φ = 1540426848.

The previous prime is 1540571971. The next prime is 1540572029. The reversal of 1540572023 is 3202750451.

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: 3202750451 = 37 ⋅86560823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540572023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540572029) 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, 55298 + ... + 78351.

It is an arithmetic number, because the mean of its divisors is an integer number (385179300).

Almost surely, 2^1540572023 is an apocalyptic number.

1540572023 is a deficient number, since it is larger than the sum of its proper divisors (145177).

1540572023 is a wasteful number, since it uses less digits than its factorization.

1540572023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145176.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 1540572023 is about 39250.1213119144. The cubic root of 1540572023 is about 1154.9433136225.

The spelling of 1540572023 in words is "one billion, five hundred forty million, five hundred seventy-two thousand, twenty-three".