1653436538 has 16 divisors (see below), whose sum is σ = 2743125000. Its totient is φ = 742499136.

The previous prime is 1653436531. The next prime is 1653436549. The reversal of 1653436538 is 8356343561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1462527049 + 190909489 = 38243^2 + 13817^2 .

It is not an unprimeable number, because it can be changed into a prime (1653436531) 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, 858413 + ... + 860336.

Almost surely, 2^1653436538 is an apocalyptic number.

1653436538 is a deficient number, since it is larger than the sum of its proper divisors (1089688462).

1653436538 is a wasteful number, since it uses less digits than its factorization.

1653436538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718801.

The product of its digits is 777600, while the sum is 44.

The square root of 1653436538 is about 40662.4708791780. The cubic root of 1653436538 is about 1182.4855531492.

The spelling of 1653436538 in words is "one billion, six hundred fifty-three million, four hundred thirty-six thousand, five hundred thirty-eight".