19401985 has 8 divisors (see below), whose sum is σ = 23357736. Its totient is φ = 15471360.

The previous prime is 19401961. The next prime is 19402003. The reversal of 19401985 is 58910491.

It can be written as a sum of positive squares in 4 ways, for example, as 121104 + 19280881 = 348^2 + 4391^2 .

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

It is not a de Polignac number, because 19401985 - 2¹¹ = 19399937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536 + ... + 7705.

It is an arithmetic number, because the mean of its divisors is an integer number (2919717).

Almost surely, 2^19401985 is an apocalyptic number.

It is an amenable number.

19401985 is a deficient number, since it is larger than the sum of its proper divisors (3955751).

19401985 is a wasteful number, since it uses less digits than its factorization.

19401985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12563.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 19401985 is about 4404.7684388626. The cubic root of 19401985 is about 268.7089023148.

The spelling of 19401985 in words is "nineteen million, four hundred one thousand, nine hundred eighty-five".