1220429 has 4 divisors (see below), whose sum is σ = 1394784. Its totient is φ = 1046076.

The previous prime is 1220423. The next prime is 1220437. The reversal of 1220429 is 9240221.

1220429 = T₅₈₇ + T₅₈₈ + ... + T₅₉₃.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220429 - 2¹⁶ = 1154893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220423) 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, 87167 + ... + 87180.

It is an arithmetic number, because the mean of its divisors is an integer number (348696).

2^1220429 is an apocalyptic number.

It is an amenable number.

1220429 is a deficient number, since it is larger than the sum of its proper divisors (174355).

1220429 is an equidigital number, since it uses as much as digits as its factorization.

1220429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174354.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1220429 is about 1104.7302838250. The cubic root of 1220429 is about 106.8654961169.

The spelling of 1220429 in words is "one million, two hundred twenty thousand, four hundred twenty-nine".