1008780921 has 24 divisors (see below), whose sum is σ = 1525567680. Its totient is φ = 641493216.

The previous prime is 1008780917. The next prime is 1008780923. The reversal of 1008780921 is 1290878001.

It is not a de Polignac number, because 1008780921 - 2² = 1008780917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1008780923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1621 + ... + 44946.

It is an arithmetic number, because the mean of its divisors is an integer number (63565320).

Almost surely, 2^1008780921 is an apocalyptic number.

It is an amenable number.

1008780921 is a deficient number, since it is larger than the sum of its proper divisors (516786759).

1008780921 is a wasteful number, since it uses less digits than its factorization.

1008780921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46685 (or 46682 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 1008780921 is about 31761.3117015025. The cubic root of 1008780921 is about 1002.9184480419.

The spelling of 1008780921 in words is "one billion, eight million, seven hundred eighty thousand, nine hundred twenty-one".