102040819 has 4 divisors (see below), whose sum is σ = 102061080. Its totient is φ = 102020560.

The previous prime is 102040801. The next prime is 102040843. The reversal of 102040819 is 918040201.

It is a happy number.

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 102040819 - 2¹³ = 102032627 is a prime.

It is a super-2 number, since 2×102040819² = 20824657484381522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102040793 and 102040802.

It is not an unprimeable number, because it can be changed into a prime (102040889) 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, 3927 + ... + 14815.

It is an arithmetic number, because the mean of its divisors is an integer number (25515270).

Almost surely, 2^102040819 is an apocalyptic number.

102040819 is a deficient number, since it is larger than the sum of its proper divisors (20261).

102040819 is an equidigital number, since it uses as much as digits as its factorization.

102040819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 102040819 is about 10101.5255778521. The cubic root of 102040819 is about 467.2951912508.

The spelling of 102040819 in words is "one hundred two million, forty thousand, eight hundred nineteen".