390747982 has 4 divisors (see below), whose sum is σ = 586121976. Its totient is φ = 195373990.

The previous prime is 390747971. The next prime is 390748019. The reversal of 390747982 is 289747093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 289747093 = 19 ⋅15249847.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97686994 + ... + 97686997.

It is an arithmetic number, because the mean of its divisors is an integer number (146530494).

Almost surely, 2^390747982 is an apocalyptic number.

390747982 is a deficient number, since it is larger than the sum of its proper divisors (195373994).

390747982 is a wasteful number, since it uses less digits than its factorization.

390747982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195373993.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 390747982 is about 19767.3463570607. The cubic root of 390747982 is about 731.0811415010.

The spelling of 390747982 in words is "three hundred ninety million, seven hundred forty-seven thousand, nine hundred eighty-two".