19400381623 has 32 divisors (see below), whose sum is σ = 25116963840. Its totient is φ = 14583836160.

The previous prime is 19400381587. The next prime is 19400381641. The reversal of 19400381623 is 32618300491.

It is a cyclic number.

It is not a de Polignac number, because 19400381623 - 2²¹ = 19398284471 is a prime.

It is a super-2 number, since 2×19400381623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400301623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67590 + ... + 208252.

It is an arithmetic number, because the mean of its divisors is an integer number (784905120).

Almost surely, 2^19400381623 is an apocalyptic number.

19400381623 is a deficient number, since it is larger than the sum of its proper divisors (5716582217).

19400381623 is a wasteful number, since it uses less digits than its factorization.

19400381623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140767.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 19400381623 in words is "nineteen billion, four hundred million, three hundred eighty-one thousand, six hundred twenty-three".