1801900229 has 4 divisors (see below), whose sum is σ = 1814863680. Its totient is φ = 1788936780.

The previous prime is 1801900189. The next prime is 1801900249. The reversal of 1801900229 is 9220091081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9220091081 = 89 ⋅103596529.

It is a cyclic number.

It is not a de Polignac number, because 1801900229 - 2⁸ = 1801899973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1801900195 and 1801900204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801900249) 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, 6481517 + ... + 6481794.

It is an arithmetic number, because the mean of its divisors is an integer number (453715920).

Almost surely, 2^1801900229 is an apocalyptic number.

It is an amenable number.

1801900229 is a deficient number, since it is larger than the sum of its proper divisors (12963451).

1801900229 is a wasteful number, since it uses less digits than its factorization.

1801900229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12963450.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1801900229 is about 42448.7953774898. The cubic root of 1801900229 is about 1216.8683069649.

The spelling of 1801900229 in words is "one billion, eight hundred one million, nine hundred thousand, two hundred twenty-nine".