100690042 has 4 divisors (see below), whose sum is σ = 151035066. Its totient is φ = 50345020.

The previous prime is 100690033. The next prime is 100690123. The reversal of 100690042 is 240096001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240096001 = 5857 ⋅40993.

It can be written as a sum of positive squares in only one way, i.e., 95667961 + 5022081 = 9781^2 + 2241^2 .

It is a super-3 number, since 3×100690042³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 100689995 and 100690022.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25172509 + ... + 25172512.

Almost surely, 2^100690042 is an apocalyptic number.

100690042 is a deficient number, since it is larger than the sum of its proper divisors (50345024).

100690042 is an equidigital number, since it uses as much as digits as its factorization.

100690042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50345023.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 100690042 is about 10034.4427847290. The cubic root of 100690042 is about 465.2240674468.

The spelling of 100690042 in words is "one hundred million, six hundred ninety thousand, forty-two".