1438945631 has 8 divisors (see below), whose sum is σ = 1510540800. Its totient is φ = 1368924120.

The previous prime is 1438945609. The next prime is 1438945649. The reversal of 1438945631 is 1365498341.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1438945631 - 2⁶ = 1438945567 is a prime.

It is a super-2 number, since 2×1438945631² = 4141129057947976322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438941631) 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, 391541 + ... + 395198.

It is an arithmetic number, because the mean of its divisors is an integer number (188817600).

Almost surely, 2^1438945631 is an apocalyptic number.

1438945631 is a deficient number, since it is larger than the sum of its proper divisors (71595169).

1438945631 is an equidigital number, since it uses as much as digits as its factorization.

1438945631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786829.

The product of its digits is 311040, while the sum is 44.

The square root of 1438945631 is about 37933.4368466660. The cubic root of 1438945631 is about 1128.9675564688.

The spelling of 1438945631 in words is "one billion, four hundred thirty-eight million, nine hundred forty-five thousand, six hundred thirty-one".