1220390 has 8 divisors (see below), whose sum is σ = 2196720. Its totient is φ = 488152.

The previous prime is 1220369. The next prime is 1220393. The reversal of 1220390 is 930221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61010 + ... + 61029.

It is an arithmetic number, because the mean of its divisors is an integer number (274590).

2^1220390 is an apocalyptic number.

1220390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220390 is a deficient number, since it is larger than the sum of its proper divisors (976330).

1220390 is a wasteful number, since it uses less digits than its factorization.

1220390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122046.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1220390 is about 1104.7126323167. The cubic root of 1220390 is about 106.8643577744.

It can be divided in two parts, 1220 and 390, that multiplied together give a triangular number (475800 = T₉₇₅).

The spelling of 1220390 in words is "one million, two hundred twenty thousand, three hundred ninety".