978740381 has 2 divisors, whose sum is σ = 978740382. Its totient is φ = 978740380.

The previous prime is 978740351. The next prime is 978740417. The reversal of 978740381 is 183047879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791296900 + 187443481 = 28130^2 + 13691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978740381 is a prime.

It is a super-2 number, since 2×978740381² = 1915865466800050322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978740351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489370190 + 489370191.

It is an arithmetic number, because the mean of its divisors is an integer number (489370191).

Almost surely, 2^978740381 is an apocalyptic number.

It is an amenable number.

978740381 is a deficient number, since it is larger than the sum of its proper divisors (1).

978740381 is an equidigital number, since it uses as much as digits as its factorization.

978740381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 978740381 is about 31284.8266896270. The cubic root of 978740381 is about 992.8626396170.

It can be divided in two parts, 97 and 8740381, that added together give a palindrome (8740478).

The spelling of 978740381 in words is "nine hundred seventy-eight million, seven hundred forty thousand, three hundred eighty-one".