1540657730 has 8 divisors (see below), whose sum is σ = 2773183932. Its totient is φ = 616263088.

The previous prime is 1540657721. The next prime is 1540657787. The reversal of 1540657730 is 377560451.

1540657730 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1504741681 + 35916049 = 38791^2 + 5993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77032877 + ... + 77032896.

Almost surely, 2^1540657730 is an apocalyptic number.

1540657730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540657730 is a deficient number, since it is larger than the sum of its proper divisors (1232526202).

1540657730 is a wasteful number, since it uses less digits than its factorization.

1540657730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154065780.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 1540657730 is about 39251.2131022724. The cubic root of 1540657730 is about 1154.9647309683.

The spelling of 1540657730 in words is "one billion, five hundred forty million, six hundred fifty-seven thousand, seven hundred thirty".