1801397629 has 4 divisors (see below), whose sum is σ = 1801521180. Its totient is φ = 1801274080.

The previous prime is 1801397627. The next prime is 1801397671. The reversal of 1801397629 is 9267931081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9267931081 = 47 ⋅197190023.

It can be written as a sum of positive squares in 2 ways, for example, as 680688100 + 1120709529 = 26090^2 + 33477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801397629 - 2¹ = 1801397627 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801397627) 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, 36442 + ... + 70219.

It is an arithmetic number, because the mean of its divisors is an integer number (450380295).

Almost surely, 2^1801397629 is an apocalyptic number.

It is an amenable number.

1801397629 is a deficient number, since it is larger than the sum of its proper divisors (123551).

1801397629 is a wasteful number, since it uses less digits than its factorization.

1801397629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123550.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1801397629 is about 42442.8748908459. The cubic root of 1801397629 is about 1216.7551569924.

The spelling of 1801397629 in words is "one billion, eight hundred one million, three hundred ninety-seven thousand, six hundred twenty-nine".