1921475485439 has 8 divisors (see below), whose sum is σ = 1962395866368. Its totient is φ = 1880556684760.

The previous prime is 1921475485409. The next prime is 1921475485507. The reversal of 1921475485439 is 9345845741291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921475485439 - 2⁸ = 1921475485183 is a prime.

It is a super-2 number, since 2×1921475485439² (a number of 25 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 (1921475485409) 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, 2249144 + ... + 2983554.

It is an arithmetic number, because the mean of its divisors is an integer number (245299483296).

Almost surely, 2^{1921475485439} is an apocalyptic number.

1921475485439 is a deficient number, since it is larger than the sum of its proper divisors (40920380929).

1921475485439 is an equidigital number, since it uses as much as digits as its factorization.

1921475485439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790125.

The product of its digits is 43545600, while the sum is 62.

The spelling of 1921475485439 in words is "one trillion, nine hundred twenty-one billion, four hundred seventy-five million, four hundred eighty-five thousand, four hundred thirty-nine".