1986712957 has 2 divisors, whose sum is σ = 1986712958. Its totient is φ = 1986712956.

The previous prime is 1986712919. The next prime is 1986712963. The reversal of 1986712957 is 7592176891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1447498116 + 539214841 = 38046^2 + 23221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986712957 - 2⁷ = 1986712829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1986712898 and 1986712907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986712967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993356478 + 993356479.

It is an arithmetic number, because the mean of its divisors is an integer number (993356479).

Almost surely, 2^1986712957 is an apocalyptic number.

It is an amenable number.

1986712957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986712957 is an equidigital number, since it uses as much as digits as its factorization.

1986712957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 55.

The square root of 1986712957 is about 44572.5583403062. The cubic root of 1986712957 is about 1257.1247440886.

The spelling of 1986712957 in words is "one billion, nine hundred eighty-six million, seven hundred twelve thousand, nine hundred fifty-seven".