1998405826 has 8 divisors (see below), whose sum is σ = 3155377680. Its totient is φ = 946613268.

The previous prime is 1998405823. The next prime is 1998405839. The reversal of 1998405826 is 6285048991.

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

It is not an unprimeable number, because it can be changed into a prime (1998405821) 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, 26294776 + ... + 26294851.

It is an arithmetic number, because the mean of its divisors is an integer number (394422210).

Almost surely, 2^1998405826 is an apocalyptic number.

1998405826 is a deficient number, since it is larger than the sum of its proper divisors (1156971854).

1998405826 is a wasteful number, since it uses less digits than its factorization.

1998405826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52589648.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 1998405826 is about 44703.5325897182. The cubic root of 1998405826 is about 1259.5862053491.

The spelling of 1998405826 in words is "one billion, nine hundred ninety-eight million, four hundred five thousand, eight hundred twenty-six".