1820537438 has 8 divisors (see below), whose sum is σ = 2763707688. Its totient is φ = 899301544.

The previous prime is 1820537417. The next prime is 1820537441. The reversal of 1820537438 is 8347350281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1820537395 and 1820537404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5483381 + ... + 5483712.

It is an arithmetic number, because the mean of its divisors is an integer number (345463461).

Almost surely, 2^1820537438 is an apocalyptic number.

1820537438 is a deficient number, since it is larger than the sum of its proper divisors (943170250).

1820537438 is a wasteful number, since it uses less digits than its factorization.

1820537438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10967178.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 1820537438 is about 42667.7564209791. The cubic root of 1820537438 is about 1221.0493162564.

The spelling of 1820537438 in words is "one billion, eight hundred twenty million, five hundred thirty-seven thousand, four hundred thirty-eight".