1638374325 has 24 divisors (see below), whose sum is σ = 3095748288. Its totient is φ = 748970880.

The previous prime is 1638374279. The next prime is 1638374327. The reversal of 1638374325 is 5234738361.

It is not a de Polignac number, because 1638374325 - 2⁷ = 1638374197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638374327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1559832 + ... + 1560881.

It is an arithmetic number, because the mean of its divisors is an integer number (128989512).

Almost surely, 2^1638374325 is an apocalyptic number.

1638374325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1638374325 is a deficient number, since it is larger than the sum of its proper divisors (1457373963).

1638374325 is a wasteful number, since it uses less digits than its factorization.

1638374325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120733 (or 3120728 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 1638374325 is about 40476.8368946982. The cubic root of 1638374325 is about 1178.8839214918.

The spelling of 1638374325 in words is "one billion, six hundred thirty-eight million, three hundred seventy-four thousand, three hundred twenty-five".