1974278869 has 2 divisors, whose sum is σ = 1974278870. Its totient is φ = 1974278868.

The previous prime is 1974278837. The next prime is 1974278921. The reversal of 1974278869 is 9688724791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995402500 + 978876369 = 31550^2 + 31287^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974278869 - 2⁵ = 1974278837 is a prime.

It is a super-2 number, since 2×1974278869² = 7795554105159838322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974275869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987139434 + 987139435.

It is an arithmetic number, because the mean of its divisors is an integer number (987139435).

Almost surely, 2^1974278869 is an apocalyptic number.

It is an amenable number.

1974278869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974278869 is an equidigital number, since it uses as much as digits as its factorization.

1974278869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 61.

The square root of 1974278869 is about 44432.8579882051. The cubic root of 1974278869 is about 1254.4966302435.

The spelling of 1974278869 in words is "one billion, nine hundred seventy-four million, two hundred seventy-eight thousand, eight hundred sixty-nine".