1644120454 has 16 divisors (see below), whose sum is σ = 2608663392. Its totient is φ = 775545408.

The previous prime is 1644120427. The next prime is 1644120497. The reversal of 1644120454 is 4540214461.

It is a super-3 number, since 3×1644120454³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241449 + ... + 248164.

It is an arithmetic number, because the mean of its divisors is an integer number (163041462).

Almost surely, 2^1644120454 is an apocalyptic number.

1644120454 is a deficient number, since it is larger than the sum of its proper divisors (964542938).

1644120454 is a wasteful number, since it uses less digits than its factorization.

1644120454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489711.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1644120454 is about 40547.7552276325. The cubic root of 1644120454 is about 1180.2605127199.

The spelling of 1644120454 in words is "one billion, six hundred forty-four million, one hundred twenty thousand, four hundred fifty-four".