1225415 has 4 divisors (see below), whose sum is σ = 1470504. Its totient is φ = 980328.

The previous prime is 1225409. The next prime is 1225459. The reversal of 1225415 is 5145221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5145221 = 461 ⋅11161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225415 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 122537 + ... + 122546.

It is an arithmetic number, because the mean of its divisors is an integer number (367626).

2^1225415 is an apocalyptic number.

1225415 is a deficient number, since it is larger than the sum of its proper divisors (245089).

1225415 is an equidigital number, since it uses as much as digits as its factorization.

1225415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245088.

The product of its digits is 400, while the sum is 20.

The square root of 1225415 is about 1106.9846430732. The cubic root of 1225415 is about 107.0108295441.

Subtracting from 1225415 its sum of digits (20), we obtain a triangular number (1225395 = T₁₅₆₅).

The spelling of 1225415 in words is "one million, two hundred twenty-five thousand, four hundred fifteen".