1540273957 has 2 divisors, whose sum is σ = 1540273958. Its totient is φ = 1540273956.

The previous prime is 1540273951. The next prime is 1540273997. The reversal of 1540273957 is 7593720451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488879396 + 51394561 = 38586^2 + 7169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540273957 - 2⁷ = 1540273829 is a prime.

It is a super-2 number, since 2×1540273957² = 4744887725224875698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540273951) 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, 770136978 + 770136979.

It is an arithmetic number, because the mean of its divisors is an integer number (770136979).

Almost surely, 2^1540273957 is an apocalyptic number.

It is an amenable number.

1540273957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540273957 is an equidigital number, since it uses as much as digits as its factorization.

1540273957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 1540273957 is about 39246.3241208651. The cubic root of 1540273957 is about 1154.8688236425.

The spelling of 1540273957 in words is "one billion, five hundred forty million, two hundred seventy-three thousand, nine hundred fifty-seven".