1861430158 has 32 divisors (see below), whose sum is σ = 3332689920. Its totient is φ = 762400320.

The previous prime is 1861430149. The next prime is 1861430167. The reversal of 1861430158 is 8510341681.

It is an interprime number because it is at equal distance from previous prime (1861430149) and next prime (1861430167).

It is a super-2 number, since 2×1861430158² = 6929844466223809928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552483 + ... + 555841.

It is an arithmetic number, because the mean of its divisors is an integer number (104146560).

Almost surely, 2^1861430158 is an apocalyptic number.

1861430158 is a deficient number, since it is larger than the sum of its proper divisors (1471259762).

1861430158 is a wasteful number, since it uses less digits than its factorization.

1861430158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1861430158 is about 43144.2946170174. The cubic root of 1861430158 is about 1230.1240666269.

The spelling of 1861430158 in words is "one billion, eight hundred sixty-one million, four hundred thirty thousand, one hundred fifty-eight".