921290 has 16 divisors (see below), whose sum is σ = 1670760. Its totient is φ = 365760.

The previous prime is 921287. The next prime is 921293. The reversal of 921290 is 92129.

921290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (921287) and next prime (921293).

It can be written as a sum of positive squares in 4 ways, for example, as 597529 + 323761 = 773^2 + 569^2 .

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921290.

It is not an unprimeable number, because it can be changed into a prime (921293) 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, 1556 + ... + 2064.

2⁹²¹²⁹⁰ is an apocalyptic number.

921290 is a deficient number, since it is larger than the sum of its proper divisors (749470).

921290 is a wasteful number, since it uses less digits than its factorization.

921290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 921290 is about 959.8385280869. The cubic root of 921290 is about 97.3043193478.

The spelling of 921290 in words is "nine hundred twenty-one thousand, two hundred ninety".