1438617631 has 4 divisors (see below), whose sum is σ = 1569401064. Its totient is φ = 1307834200.

The previous prime is 1438617629. The next prime is 1438617641. The reversal of 1438617631 is 1367168341.

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

It is a cyclic number.

It is not a de Polignac number, because 1438617631 - 2¹ = 1438617629 is a prime.

It is a super-2 number, since 2×1438617631² = 4139241376448104322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438617611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65391700 + ... + 65391721.

It is an arithmetic number, because the mean of its divisors is an integer number (392350266).

Almost surely, 2^1438617631 is an apocalyptic number.

1438617631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1438617631 is a deficient number, since it is larger than the sum of its proper divisors (130783433).

1438617631 is a wasteful number, since it uses less digits than its factorization.

1438617631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130783432.

The product of its digits is 72576, while the sum is 40.

The square root of 1438617631 is about 37929.1132377228. The cubic root of 1438617631 is about 1128.8817692345.

The spelling of 1438617631 in words is "one billion, four hundred thirty-eight million, six hundred seventeen thousand, six hundred thirty-one".