1220415 has 32 divisors (see below), whose sum is σ = 2280960. Its totient is φ = 545664.

The previous prime is 1220411. The next prime is 1220423. The reversal of 1220415 is 5140221.

It is not a de Polignac number, because 1220415 - 2² = 1220411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 1220394 and 1220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6097 + ... + 6293.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2^1220415 is an apocalyptic number.

1220415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220415 is a deficient number, since it is larger than the sum of its proper divisors (1060545).

1220415 is a wasteful number, since it uses less digits than its factorization.

1220415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1220415 is about 1104.7239474185. The cubic root of 1220415 is about 106.8650874839.

Adding to 1220415 its reverse (5140221), we get a palindrome (6360636).

The spelling of 1220415 in words is "one million, two hundred twenty thousand, four hundred fifteen".