1490921 has 2 divisors, whose sum is σ = 1490922. Its totient is φ = 1490920.

The previous prime is 1490899. The next prime is 1490933. The reversal of 1490921 is 1290941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 193600 = 1139^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1490921 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (1490941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745460 + 745461.

It is an arithmetic number, because the mean of its divisors is an integer number (745461).

2^1490921 is an apocalyptic number.

It is an amenable number.

1490921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1490921 is an equidigital number, since it uses as much as digits as its factorization.

1490921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1490921 is about 1221.0327595933. The cubic root of 1490921 is about 114.2400042648.

The spelling of 1490921 in words is "one million, four hundred ninety thousand, nine hundred twenty-one".