654436138 has 4 divisors (see below), whose sum is σ = 981654210. Its totient is φ = 327218068.

The previous prime is 654436099. The next prime is 654436157. The reversal of 654436138 is 831634456.

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., 453562209 + 200873929 = 21297^2 + 14173^2 .

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 a self number, because there is not a number n which added to its sum of digits gives 654436138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163609033 + ... + 163609036.

Almost surely, 2^654436138 is an apocalyptic number.

654436138 is a deficient number, since it is larger than the sum of its proper divisors (327218072).

654436138 is a wasteful number, since it uses less digits than its factorization.

654436138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327218071.

The product of its digits is 207360, while the sum is 40.

The square root of 654436138 is about 25581.9494565993. The cubic root of 654436138 is about 868.2052833710.

The spelling of 654436138 in words is "six hundred fifty-four million, four hundred thirty-six thousand, one hundred thirty-eight".