1860421 has 2 divisors, whose sum is σ = 1860422. Its totient is φ = 1860420.

The previous prime is 1860407. The next prime is 1860427. The reversal of 1860421 is 1240681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1852321 + 8100 = 1361^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860421 - 2¹⁹ = 1336133 is a prime.

It is a super-2 number, since 2×1860421² = 6922332594482, which contains 22 as substring.

1860421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1860392 and 1860401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1860427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930210 + 930211.

It is an arithmetic number, because the mean of its divisors is an integer number (930211).

2^1860421 is an apocalyptic number.

It is an amenable number.

1860421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860421 is an equidigital number, since it uses as much as digits as its factorization.

1860421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1860421 is about 1363.9725070543. The cubic root of 1860421 is about 122.9901726125.

The spelling of 1860421 in words is "one million, eight hundred sixty thousand, four hundred twenty-one".