1540213025 has 12 divisors (see below), whose sum is σ = 2056777212. Its totient is φ = 1137387840.

The previous prime is 1540212977. The next prime is 1540213027. The reversal of 1540213025 is 5203120451.

It can be written as a sum of positive squares in 6 ways, for example, as 24512401 + 1515700624 = 4951^2 + 38932^2 .

It is not a de Polignac number, because 1540213025 - 2⁸ = 1540212769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1540213027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2369234 + ... + 2369883.

It is an arithmetic number, because the mean of its divisors is an integer number (171398101).

Almost surely, 2^1540213025 is an apocalyptic number.

It is an amenable number.

1540213025 is a deficient number, since it is larger than the sum of its proper divisors (516564187).

1540213025 is a wasteful number, since it uses less digits than its factorization.

1540213025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739140 (or 4739135 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1540213025 is about 39245.5478366655. The cubic root of 1540213025 is about 1154.8535948808.

Adding to 1540213025 its reverse (5203120451), we get a palindrome (6743333476).

The spelling of 1540213025 in words is "one billion, five hundred forty million, two hundred thirteen thousand, twenty-five".