1538835797 has 6 divisors (see below), whose sum is σ = 1575456822. Its totient is φ = 1503047112.

The previous prime is 1538835791. The next prime is 1538835829. The reversal of 1538835797 is 7975388351.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1521078001 + 17757796 = 39001^2 + 4214^2 .

It is not a de Polignac number, because 1538835797 - 2⁸ = 1538835541 is a prime.

It is a super-2 number, since 2×1538835797² = 4736031220257250418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538835791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 414278 + ... + 417975.

It is an arithmetic number, because the mean of its divisors is an integer number (262576137).

Almost surely, 2^1538835797 is an apocalyptic number.

It is an amenable number.

1538835797 is a deficient number, since it is larger than the sum of its proper divisors (36621025).

1538835797 is an frugal number, since it uses more digits than its factorization.

1538835797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832339 (or 832296 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 56.

The square root of 1538835797 is about 39227.9976164983. The cubic root of 1538835797 is about 1154.5092764911.

The spelling of 1538835797 in words is "one billion, five hundred thirty-eight million, eight hundred thirty-five thousand, seven hundred ninety-seven".