1225455 has 32 divisors (see below), whose sum is σ = 2446848. Its totient is φ = 508800.

The previous prime is 1225409. The next prime is 1225459. The reversal of 1225455 is 5545221.

1225455 = T₁₈₃ + T₁₈₄ + ... + T₂₃₇.

It is a happy number.

It is not a de Polignac number, because 1225455 - 2⁷ = 1225327 is a prime.

1225455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 625 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (76464).

2^1225455 is an apocalyptic number.

1225455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1225455 is a deficient number, since it is larger than the sum of its proper divisors (1221393).

1225455 is a wasteful number, since it uses less digits than its factorization.

1225455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its digits is 2000, while the sum is 24.

The square root of 1225455 is about 1107.0027100238. The cubic root of 1225455 is about 107.0119938807.

It can be divided in two parts, 1 and 225455, that added together give a triangular number (225456 = T₆₇₁).

The spelling of 1225455 in words is "one million, two hundred twenty-five thousand, four hundred fifty-five".