1540057023 has 16 divisors (see below), whose sum is σ = 2380765440. Its totient is φ = 982064952.

The previous prime is 1540057019. The next prime is 1540057061. The reversal of 1540057023 is 3207500451.

It is a happy number.

It is not a de Polignac number, because 1540057023 - 2² = 1540057019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540057063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239361 + ... + 1240602.

It is an arithmetic number, because the mean of its divisors is an integer number (148797840).

Almost surely, 2^1540057023 is an apocalyptic number.

1540057023 is a deficient number, since it is larger than the sum of its proper divisors (840708417).

1540057023 is a wasteful number, since it uses less digits than its factorization.

1540057023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479995 (or 2479989 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 1540057023 is about 39243.5602742667. The cubic root of 1540057023 is about 1154.8146034014.

Adding to 1540057023 its reverse (3207500451), we get a palindrome (4747557474).

It can be divided in two parts, 154005 and 7023, that added together give a triangular number (161028 = T₅₆₇).

The spelling of 1540057023 in words is "one billion, five hundred forty million, fifty-seven thousand, twenty-three".