1810400329 has 6 divisors (see below), whose sum is σ = 1923159134. Its totient is φ = 1703905920.

The previous prime is 1810400327. The next prime is 1810400359. The reversal of 1810400329 is 9230040181.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 304572304 + 1505828025 = 17452^2 + 38805^2 .

It is not a de Polignac number, because 1810400329 - 2¹ = 1810400327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1810400297 and 1810400306.

It is not an unprimeable number, because it can be changed into a prime (1810400323) 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, 3131892 + ... + 3132469.

Almost surely, 2^1810400329 is an apocalyptic number.

It is an amenable number.

1810400329 is a deficient number, since it is larger than the sum of its proper divisors (112758805).

1810400329 is an equidigital number, since it uses as much as digits as its factorization.

1810400329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6264395 (or 6264378 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1810400329 is about 42548.7993837664. The cubic root of 1810400329 is about 1218.7787494634.

The spelling of 1810400329 in words is "one billion, eight hundred ten million, four hundred thousand, three hundred twenty-nine".