1921425 has 48 divisors (see below), whose sum is σ = 3696192. Its totient is φ = 870400.

The previous prime is 1921417. The next prime is 1921427. The reversal of 1921425 is 5241291.

1921425 = 171² + 172² + ... + 220².

It is not a de Polignac number, because 1921425 - 2³ = 1921417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1921395 and 1921404.

It is not an unprimeable number, because it can be changed into a prime (1921427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13957 + ... + 14093.

It is an arithmetic number, because the mean of its divisors is an integer number (77004).

2^1921425 is an apocalyptic number.

1921425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921425 is a deficient number, since it is larger than the sum of its proper divisors (1774767).

1921425 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (1921424) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (173).

1921425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 173 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 1921425 is about 1386.1547532653. The cubic root of 1921425 is about 124.3200412892.

It can be divided in two parts, 1921 and 425, that added together give a triangular number (2346 = T₆₈).

The spelling of 1921425 in words is "one million, nine hundred twenty-one thousand, four hundred twenty-five".