100400019 has 4 divisors (see below), whose sum is σ = 133866696. Its totient is φ = 66933344.

The previous prime is 100400017. The next prime is 100400023. The reversal of 100400019 is 910004001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100400019 - 2¹ = 100400017 is a prime.

It is a super-2 number, since 2×100400019² = 20160327630400722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100399980 and 100400007.

It is not an unprimeable number, because it can be changed into a prime (100400017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16733334 + ... + 16733339.

It is an arithmetic number, because the mean of its divisors is an integer number (33466674).

Almost surely, 2^100400019 is an apocalyptic number.

100400019 is a deficient number, since it is larger than the sum of its proper divisors (33466677).

100400019 is an equidigital number, since it uses as much as digits as its factorization.

100400019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33466676.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 100400019 is about 10019.9809880059. The cubic root of 100400019 is about 464.7769678485.

The spelling of 100400019 in words is "one hundred million, four hundred thousand, nineteen".