1802421 has 12 divisors (see below), whose sum is σ = 2616640. Its totient is φ = 1195560.

The previous prime is 1802419. The next prime is 1802491. The reversal of 1802421 is 1242081.

It is not a de Polignac number, because 1802421 - 2¹ = 1802419 is a prime.

It is a super-2 number, since 2×1802421² = 6497442922482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1802394 and 1802403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1802491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2070 + ... + 2808.

2^1802421 is an apocalyptic number.

It is an amenable number.

1802421 is a deficient number, since it is larger than the sum of its proper divisors (814219).

1802421 is a wasteful number, since it uses less digits than its factorization.

1802421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1802421 is about 1342.5427367499. The cubic root of 1802421 is about 121.6985525568.

It can be divided in two parts, 180 and 2421, that added together give a square (2601 = 51²).

The spelling of 1802421 in words is "one million, eight hundred two thousand, four hundred twenty-one".