19380631 has 4 divisors (see below), whose sum is σ = 19520200. Its totient is φ = 19241064.

The previous prime is 19380623. The next prime is 19380653. The reversal of 19380631 is 13608391.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19380631 - 2³ = 19380623 is a prime.

It is a super-2 number, since 2×19380631² = 751217715916322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19380593 and 19380602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19380601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69576 + ... + 69853.

It is an arithmetic number, because the mean of its divisors is an integer number (4880050).

Almost surely, 2^19380631 is an apocalyptic number.

19380631 is a deficient number, since it is larger than the sum of its proper divisors (139569).

19380631 is a wasteful number, since it uses less digits than its factorization.

19380631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139568.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 19380631 is about 4402.3438075643. The cubic root of 19380631 is about 268.6102849777.

The spelling of 19380631 in words is "nineteen million, three hundred eighty thousand, six hundred thirty-one".