1955421 has 24 divisors (see below), whose sum is σ = 3159520. Its totient is φ = 1201392.

The previous prime is 1955417. The next prime is 1955467. The reversal of 1955421 is 1245591.

It is not a de Polignac number, because 1955421 - 2² = 1955417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2850 + ... + 3468.

2^1955421 is an apocalyptic number.

It is an amenable number.

1955421 is a deficient number, since it is larger than the sum of its proper divisors (1204099).

1955421 is an equidigital number, since it uses as much as digits as its factorization.

1955421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 635 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 1955421 is about 1398.3636865994. The cubic root of 1955421 is about 125.0489621525.

The spelling of 1955421 in words is "one million, nine hundred fifty-five thousand, four hundred twenty-one".