1538225999 has 16 divisors (see below), whose sum is σ = 1588823808. Its totient is φ = 1488687552.

The previous prime is 1538225911. The next prime is 1538226007. The reversal of 1538225999 is 9995228351.

It is a cyclic number.

It is not a de Polignac number, because 1538225999 - 2¹² = 1538221903 is a prime.

It is a super-2 number, since 2×1538225999² = 4732278447999096002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538225999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538224999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944624 + ... + 946250.

It is an arithmetic number, because the mean of its divisors is an integer number (99301488).

Almost surely, 2^1538225999 is an apocalyptic number.

1538225999 is a deficient number, since it is larger than the sum of its proper divisors (50597809).

1538225999 is a wasteful number, since it uses less digits than its factorization.

1538225999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934.

The product of its digits is 1749600, while the sum is 53.

The square root of 1538225999 is about 39220.2243619284. The cubic root of 1538225999 is about 1154.3567563275.

The spelling of 1538225999 in words is "one billion, five hundred thirty-eight million, two hundred twenty-five thousand, nine hundred ninety-nine".