481639138 has 16 divisors (see below), whose sum is σ = 785632824. Its totient is φ = 220527360.

The previous prime is 481639133. The next prime is 481639139. The reversal of 481639138 is 831936184.

It can be written as a sum of positive squares in 4 ways, for example, as 467554129 + 14085009 = 21623^2 + 3753^2 .

It is a junction number, because it is equal to n+sod(n) for n = 481639094 and 481639103.

It is not an unprimeable number, because it can be changed into a prime (481639133) 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, 190173 + ... + 192688.

Almost surely, 2^481639138 is an apocalyptic number.

481639138 is a deficient number, since it is larger than the sum of its proper divisors (303993686).

481639138 is a wasteful number, since it uses less digits than its factorization.

481639138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382917.

The product of its digits is 124416, while the sum is 43.

The square root of 481639138 is about 21946.2784544442. The cubic root of 481639138 is about 783.8637668065.

The spelling of 481639138 in words is "four hundred eighty-one million, six hundred thirty-nine thousand, one hundred thirty-eight".