1638342 has 12 divisors (see below), whose sum is σ = 3549780. Its totient is φ = 546108.

The previous prime is 1638331. The next prime is 1638347. The reversal of 1638342 is 2438361.

It is a happy number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45492 + ... + 45527.

It is an arithmetic number, because the mean of its divisors is an integer number (295815).

2^1638342 is an apocalyptic number.

1638342 is an abundant number, since it is smaller than the sum of its proper divisors (1911438).

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

1638342 is a wasteful number, since it uses less digits than its factorization.

1638342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91027 (or 91024 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 1638342 is about 1279.9773435495. The cubic root of 1638342 is about 117.8876168344.

The spelling of 1638342 in words is "one million, six hundred thirty-eight thousand, three hundred forty-two".