1216425 has 36 divisors (see below), whose sum is σ = 2346576. Its totient is φ = 554400.

The previous prime is 1216421. The next prime is 1216433. The reversal of 1216425 is 5246121.

1216425 = T₁₀₆ + T₁₀₇ + ... + T₂₀₃.

It is not a de Polignac number, because 1216425 - 2² = 1216421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216421) 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 35 ways as a sum of consecutive naturals, for example, 3510 + ... + 3840.

2^1216425 is an apocalyptic number.

1216425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216425 is a deficient number, since it is larger than the sum of its proper divisors (1130151).

1216425 is a wasteful number, since it uses less digits than its factorization.

1216425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 346 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1216425 is about 1102.9165879612. The cubic root of 1216425 is about 106.7484994862.

The spelling of 1216425 in words is "one million, two hundred sixteen thousand, four hundred twenty-five".