1625421 has 32 divisors (see below), whose sum is σ = 2730240. Its totient is φ = 838656.

The previous prime is 1625419. The next prime is 1625453. The reversal of 1625421 is 1245261.

It is not a de Polignac number, because 1625421 - 2¹ = 1625419 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625461) 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 31 ways as a sum of consecutive naturals, for example, 10275 + ... + 10431.

It is an arithmetic number, because the mean of its divisors is an integer number (85320).

2^1625421 is an apocalyptic number.

It is an amenable number.

1625421 is a deficient number, since it is larger than the sum of its proper divisors (1104819).

1625421 is a wasteful number, since it uses less digits than its factorization.

1625421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213.

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

The square root of 1625421 is about 1274.9199974900. The cubic root of 1625421 is about 117.5768864520.

The spelling of 1625421 in words is "one million, six hundred twenty-five thousand, four hundred twenty-one".