1639398 has 8 divisors (see below), whose sum is σ = 3278808. Its totient is φ = 546464.

The previous prime is 1639387. The next prime is 1639409. The reversal of 1639398 is 8939361.

It is an interprime number because it is at equal distance from previous prime (1639387) and next prime (1639409).

It is a sphenic number, since it is the product of 3 distinct primes.

1639398 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136611 + ... + 136622.

It is an arithmetic number, because the mean of its divisors is an integer number (409851).

2^1639398 is an apocalyptic number.

1639398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1639398 is a wasteful number, since it uses less digits than its factorization.

1639398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273238.

The product of its digits is 34992, while the sum is 39.

The square root of 1639398 is about 1280.3897844016. The cubic root of 1639398 is about 117.9129397089.

The spelling of 1639398 in words is "one million, six hundred thirty-nine thousand, three hundred ninety-eight".