1381804873 has 2 divisors, whose sum is σ = 1381804874. Its totient is φ = 1381804872.

The previous prime is 1381804859. The next prime is 1381804877. The reversal of 1381804873 is 3784081831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1139940169 + 241864704 = 33763^2 + 15552^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381804873 - 2²⁵ = 1348250441 is a prime.

It is a super-2 number, since 2×1381804873² = 3818769414093092258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1381804877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690902436 + 690902437.

It is an arithmetic number, because the mean of its divisors is an integer number (690902437).

Almost surely, 2^1381804873 is an apocalyptic number.

It is an amenable number.

1381804873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381804873 is an equidigital number, since it uses as much as digits as its factorization.

1381804873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1381804873 is about 37172.6360781691. The cubic root of 1381804873 is about 1113.8214397818.

The spelling of 1381804873 in words is "one billion, three hundred eighty-one million, eight hundred four thousand, eight hundred seventy-three".