1021980479 has 4 divisors (see below), whose sum is σ = 1100594376. Its totient is φ = 943366584.

The previous prime is 1021980451. The next prime is 1021980499. The reversal of 1021980479 is 9740891201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021980479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021980409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39306929 + ... + 39306954.

It is an arithmetic number, because the mean of its divisors is an integer number (275148594).

Almost surely, 2^1021980479 is an apocalyptic number.

1021980479 is a deficient number, since it is larger than the sum of its proper divisors (78613897).

1021980479 is an equidigital number, since it uses as much as digits as its factorization.

1021980479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78613896.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1021980479 is about 31968.4294109048. The cubic root of 1021980479 is about 1007.2737900313.

The spelling of 1021980479 in words is "one billion, twenty-one million, nine hundred eighty thousand, four hundred seventy-nine".