1221490 has 8 divisors (see below), whose sum is σ = 2198700. Its totient is φ = 488592.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221490 is 941221.

It can be written as a sum of positive squares in 2 ways, for example, as 1207801 + 13689 = 1099^2 + 117^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1221499) 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, 61065 + ... + 61084.

2^1221490 is an apocalyptic number.

1221490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221490 is a deficient number, since it is larger than the sum of its proper divisors (977210).

1221490 is a wasteful number, since it uses less digits than its factorization.

1221490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122156.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1221490 is about 1105.2103872114. The cubic root of 1221490 is about 106.8964555718.

It can be divided in two parts, 1221 and 490, that added together give a triangular number (1711 = T₅₈).

The spelling of 1221490 in words is "one million, two hundred twenty-one thousand, four hundred ninety".