1644294379 has 8 divisors (see below), whose sum is σ = 2023747040. Its totient is φ = 1300980096.

The previous prime is 1644294373. The next prime is 1644294401. The reversal of 1644294379 is 9734924461.

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

It is not a de Polignac number, because 1644294379 - 2⁵ = 1644294347 is a prime.

It is a super-3 number, since 3×1644294379³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644294373) 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, 9034494 + ... + 9034675.

It is an arithmetic number, because the mean of its divisors is an integer number (252968380).

Almost surely, 2^1644294379 is an apocalyptic number.

1644294379 is a deficient number, since it is larger than the sum of its proper divisors (379452661).

1644294379 is a wasteful number, since it uses less digits than its factorization.

1644294379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18069189.

The product of its digits is 1306368, while the sum is 49.

The square root of 1644294379 is about 40549.8998642413. The cubic root of 1644294379 is about 1180.3021296163.

The spelling of 1644294379 in words is "one billion, six hundred forty-four million, two hundred ninety-four thousand, three hundred seventy-nine".