1538438602 has 4 divisors (see below), whose sum is σ = 2307657906. Its totient is φ = 769219300.

The previous prime is 1538438593. The next prime is 1538438609. The reversal of 1538438602 is 2068348351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1242633001 + 295805601 = 35251^2 + 17199^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1538438609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384609649 + ... + 384609652.

Almost surely, 2^1538438602 is an apocalyptic number.

1538438602 is a deficient number, since it is larger than the sum of its proper divisors (769219304).

1538438602 is an equidigital number, since it uses as much as digits as its factorization.

1538438602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769219303.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 1538438602 is about 39222.9346428846. The cubic root of 1538438602 is about 1154.4099362902.

The spelling of 1538438602 in words is "one billion, five hundred thirty-eight million, four hundred thirty-eight thousand, six hundred two".