1644057453 has 8 divisors (see below), whose sum is σ = 2211475968. Its totient is φ = 1086338624.

The previous prime is 1644057449. The next prime is 1644057463. The reversal of 1644057453 is 3547504461.

It is a happy number.

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 1644057453 - 2² = 1644057449 is a prime.

It is a super-3 number, since 3×1644057453³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644057413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2424525 + ... + 2425202.

It is an arithmetic number, because the mean of its divisors is an integer number (276434496).

Almost surely, 2^1644057453 is an apocalyptic number.

It is an amenable number.

1644057453 is a deficient number, since it is larger than the sum of its proper divisors (567418515).

1644057453 is a wasteful number, since it uses less digits than its factorization.

1644057453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849843.

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 1644057453 is about 40546.9783461111. The cubic root of 1644057453 is about 1180.2454370722.

The spelling of 1644057453 in words is "one billion, six hundred forty-four million, fifty-seven thousand, four hundred fifty-three".