1538454730 has 16 divisors (see below), whose sum is σ = 2781107784. Its totient is φ = 612739840.

The previous prime is 1538454721. The next prime is 1538454739. The reversal of 1538454730 is 374548351.

It is an interprime number because it is at equal distance from previous prime (1538454721) and next prime (1538454739).

It can be written as a sum of positive squares in 4 ways, for example, as 450840289 + 1087614441 = 21233^2 + 32979^2 .

It is not an unprimeable number, because it can be changed into a prime (1538454739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327811 + ... + 332470.

Almost surely, 2^1538454730 is an apocalyptic number.

1538454730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1538454730 is a deficient number, since it is larger than the sum of its proper divisors (1242653054).

1538454730 is a wasteful number, since it uses less digits than its factorization.

1538454730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660521.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 1538454730 is about 39223.1402363452. The cubic root of 1538454730 is about 1154.4139703063.

The spelling of 1538454730 in words is "one billion, five hundred thirty-eight million, four hundred fifty-four thousand, seven hundred thirty".