1798921738 has 4 divisors (see below), whose sum is σ = 2698382610. Its totient is φ = 899460868.

The previous prime is 1798921711. The next prime is 1798921753. The reversal of 1798921738 is 8371298971.

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

It can be written as a sum of positive squares in only one way, i.e., 1748326969 + 50594769 = 41813^2 + 7113^2 .

It is a super-2 number, since 2×1798921738² = 6472238838897881288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449730433 + ... + 449730436.

Almost surely, 2^1798921738 is an apocalyptic number.

1798921738 is a deficient number, since it is larger than the sum of its proper divisors (899460872).

1798921738 is an equidigital number, since it uses as much as digits as its factorization.

1798921738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899460871.

The product of its digits is 1524096, while the sum is 55.

The square root of 1798921738 is about 42413.6975280392. The cubic root of 1798921738 is about 1216.1974540312.

The spelling of 1798921738 in words is "one billion, seven hundred ninety-eight million, nine hundred twenty-one thousand, seven hundred thirty-eight".