1638474 has 32 divisors (see below), whose sum is σ = 3538944. Its totient is φ = 504240.

The previous prime is 1638473. The next prime is 1638487. The reversal of 1638474 is 4748361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4087 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (110592).

2^1638474 is an apocalyptic number.

1638474 is an abundant number, since it is smaller than the sum of its proper divisors (1900470).

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

1638474 is a wasteful number, since it uses less digits than its factorization.

1638474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442.

The product of its digits is 16128, while the sum is 33.

The square root of 1638474 is about 1280.0289059236. The cubic root of 1638474 is about 117.8907827887.

It can be divided in two parts, 1638 and 474, that added together give a palindrome (2112).

The spelling of 1638474 in words is "one million, six hundred thirty-eight thousand, four hundred seventy-four".