1644268942 has 16 divisors (see below), whose sum is σ = 2586585600. Its totient is φ = 782433432.

The previous prime is 1644268921. The next prime is 1644268943. The reversal of 1644268942 is 2498624461.

It is a super-3 number, since 3×1644268942³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 1644268892 and 1644268901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644268943) 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, 80658 + ... + 98965.

It is an arithmetic number, because the mean of its divisors is an integer number (161661600).

Almost surely, 2^1644268942 is an apocalyptic number.

1644268942 is a deficient number, since it is larger than the sum of its proper divisors (942316658).

1644268942 is a wasteful number, since it uses less digits than its factorization.

1644268942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179847.

The product of its digits is 663552, while the sum is 46.

The square root of 1644268942 is about 40549.5862124387. The cubic root of 1644268942 is about 1180.2960432162.

The spelling of 1644268942 in words is "one billion, six hundred forty-four million, two hundred sixty-eight thousand, nine hundred forty-two".