163400639 has 4 divisors (see below), whose sum is σ = 166079400. Its totient is φ = 160721880.

The previous prime is 163400609. The next prime is 163400669. The reversal of 163400639 is 936004361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936004361 = 6803 ⋅137587.

It is an interprime number because it is at equal distance from previous prime (163400609) and next prime (163400669).

It is a cyclic number.

It is not a de Polignac number, because 163400639 - 2⁸ = 163400383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163400609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339289 + ... + 1339410.

It is an arithmetic number, because the mean of its divisors is an integer number (41519850).

Almost surely, 2^163400639 is an apocalyptic number.

163400639 is a deficient number, since it is larger than the sum of its proper divisors (2678761).

163400639 is an equidigital number, since it uses as much as digits as its factorization.

163400639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678760.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 163400639 is about 12782.8259395174. The cubic root of 163400639 is about 546.7027395804.

The spelling of 163400639 in words is "one hundred sixty-three million, four hundred thousand, six hundred thirty-nine".