100643942 has 12 divisors (see below), whose sum is σ = 175613580. Its totient is φ = 43133076.

The previous prime is 100643941. The next prime is 100643953. The reversal of 100643942 is 249346001.

It is a super-2 number, since 2×100643942² = 20258406122598728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100643941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 513392 + ... + 513587.

It is an arithmetic number, because the mean of its divisors is an integer number (14634465).

Almost surely, 2^100643942 is an apocalyptic number.

100643942 is a deficient number, since it is larger than the sum of its proper divisors (74969638).

100643942 is a wasteful number, since it uses less digits than its factorization.

100643942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026995 (or 1026988 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 100643942 is about 10032.1454335551. The cubic root of 100643942 is about 465.1530571033.

Adding to 100643942 its reverse (249346001), we get a palindrome (349989943).

The spelling of 100643942 in words is "one hundred million, six hundred forty-three thousand, nine hundred forty-two".