1798978026 has 16 divisors (see below), whose sum is σ = 3787322400. Its totient is φ = 568098288.

The previous prime is 1798978021. The next prime is 1798978031. The reversal of 1798978026 is 6208798971.

It is an interprime number because it is at equal distance from previous prime (1798978021) and next prime (1798978031).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (1798978021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7890141 + ... + 7890368.

It is an arithmetic number, because the mean of its divisors is an integer number (236707650).

Almost surely, 2^1798978026 is an apocalyptic number.

1798978026 is an abundant number, since it is smaller than the sum of its proper divisors (1988344374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1798978026 is a wasteful number, since it uses less digits than its factorization.

1798978026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15780533.

The product of its (nonzero) digits is 3048192, while the sum is 57.

The square root of 1798978026 is about 42414.3610820675. The cubic root of 1798978026 is about 1216.2101387795.

The spelling of 1798978026 in words is "one billion, seven hundred ninety-eight million, nine hundred seventy-eight thousand, twenty-six".