1026990921 has 8 divisors (see below), whose sum is σ = 1493805024. Its totient is φ = 622418720.

The previous prime is 1026990857. The next prime is 1026990953. The reversal of 1026990921 is 1290996201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1026990921 - 2⁶ = 1026990857 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1026990921.

It is not an unprimeable number, because it can be changed into a prime (1026970921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15560436 + ... + 15560501.

It is an arithmetic number, because the mean of its divisors is an integer number (186725628).

Almost surely, 2^1026990921 is an apocalyptic number.

1026990921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1026990921 is a deficient number, since it is larger than the sum of its proper divisors (466814103).

1026990921 is a wasteful number, since it uses less digits than its factorization.

1026990921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31120951.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1026990921 is about 32046.6990655824. The cubic root of 1026990921 is about 1008.9172204891.

The spelling of 1026990921 in words is "one billion, twenty-six million, nine hundred ninety thousand, nine hundred twenty-one".