19140639 has 8 divisors (see below), whose sum is σ = 29166720. Its totient is φ = 10937496.

The previous prime is 19140631. The next prime is 19140643. The reversal of 19140639 is 93604191.

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

It is not a de Polignac number, because 19140639 - 2³ = 19140631 is a prime.

It is a super-2 number, since 2×19140639² = 732728122656642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19140631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455709 + ... + 455750.

It is an arithmetic number, because the mean of its divisors is an integer number (3645840).

Almost surely, 2^19140639 is an apocalyptic number.

19140639 is a deficient number, since it is larger than the sum of its proper divisors (10026081).

19140639 is an equidigital number, since it uses as much as digits as its factorization.

19140639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911469.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 19140639 is about 4375.0015999997. The cubic root of 19140639 is about 267.4969353595.

The spelling of 19140639 in words is "nineteen million, one hundred forty thousand, six hundred thirty-nine".