1820628542 has 4 divisors (see below), whose sum is σ = 2730942816. Its totient is φ = 910314270.

The previous prime is 1820628517. The next prime is 1820628571. The reversal of 1820628542 is 2458260281.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 1820628496 and 1820628505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455157134 + ... + 455157137.

It is an arithmetic number, because the mean of its divisors is an integer number (682735704).

Almost surely, 2^1820628542 is an apocalyptic number.

1820628542 is a deficient number, since it is larger than the sum of its proper divisors (910314274).

1820628542 is an equidigital number, since it uses as much as digits as its factorization.

1820628542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910314273.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 1820628542 is about 42668.8240053555. The cubic root of 1820628542 is about 1221.0696839821.

The spelling of 1820628542 in words is "one billion, eight hundred twenty million, six hundred twenty-eight thousand, five hundred forty-two".