1438631425 has 72 divisors (see below), whose sum is σ = 2278327392. Its totient is φ = 891072000.

The previous prime is 1438631407. The next prime is 1438631429. The reversal of 1438631425 is 5241368341.

It is not a de Polignac number, because 1438631425 - 2⁹ = 1438630913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438631429) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3247254 + ... + 3247696.

It is an arithmetic number, because the mean of its divisors is an integer number (31643436).

Almost surely, 2^1438631425 is an apocalyptic number.

It is an amenable number.

1438631425 is a deficient number, since it is larger than the sum of its proper divisors (839695967).

1438631425 is a wasteful number, since it uses less digits than its factorization.

1438631425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 707 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 1438631425 is about 37929.2950764973. The cubic root of 1438631425 is about 1128.8853772688.

Adding to 1438631425 its reverse (5241368341), we get a palindrome (6679999766).

It can be divided in two parts, 1438631 and 425, that added together give a triangular number (1439056 = T₁₆₉₆).

The spelling of 1438631425 in words is "one billion, four hundred thirty-eight million, six hundred thirty-one thousand, four hundred twenty-five".