387142757 has 2 divisors, whose sum is σ = 387142758. Its totient is φ = 387142756.

The previous prime is 387142747. The next prime is 387142771. The reversal of 387142757 is 757241783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386279716 + 863041 = 19654^2 + 929^2 .

It is an emirp because it is prime and its reverse (757241783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387142757 - 2²² = 382948453 is a prime.

It is a super-2 number, since 2×387142757² = 299759028595122098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387142747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193571378 + 193571379.

It is an arithmetic number, because the mean of its divisors is an integer number (193571379).

Almost surely, 2^387142757 is an apocalyptic number.

It is an amenable number.

387142757 is a deficient number, since it is larger than the sum of its proper divisors (1).

387142757 is an equidigital number, since it uses as much as digits as its factorization.

387142757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 44.

The square root of 387142757 is about 19675.9436114256. The cubic root of 387142757 is about 728.8257577713.

The spelling of 387142757 in words is "three hundred eighty-seven million, one hundred forty-two thousand, seven hundred fifty-seven".