1540730 has 8 divisors (see below), whose sum is σ = 2773332. Its totient is φ = 616288.

The previous prime is 1540711. The next prime is 1540751. The reversal of 1540730 is 370451.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 284089 = 1121^2 + 533^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77027 + ... + 77046.

2^1540730 is an apocalyptic number.

1540730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540730 is a deficient number, since it is larger than the sum of its proper divisors (1232602).

1540730 is a wasteful number, since it uses less digits than its factorization.

1540730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154080.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1540730 is about 1241.2614551334. The cubic root of 1540730 is about 115.4982789921.

The spelling of 1540730 in words is "one million, five hundred forty thousand, seven hundred thirty".