638901452 has 96 divisors (see below), whose sum is σ = 1376040960. Its totient is φ = 253693440.

The previous prime is 638901451. The next prime is 638901479. The reversal of 638901452 is 254109836.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (638901451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4069358 + ... + 4069514.

It is an arithmetic number, because the mean of its divisors is an integer number (14333760).

Almost surely, 2^638901452 is an apocalyptic number.

It is a pronic number, being equal to 25276×25277.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638901452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688020480).

638901452 is an abundant number, since it is smaller than the sum of its proper divisors (737139508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638901452 is a wasteful number, since it uses less digits than its factorization.

638901452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 638901452 is about 25276.4999950547. The cubic root of 638901452 is about 861.2805207267.

The spelling of 638901452 in words is "six hundred thirty-eight million, nine hundred one thousand, four hundred fifty-two".