1087421 has 4 divisors (see below), whose sum is σ = 1090752. Its totient is φ = 1084092.

The previous prime is 1087409. The next prime is 1087423. The reversal of 1087421 is 1247801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1087421 - 2⁶ = 1087357 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (272688).

2^1087421 is an apocalyptic number.

It is an amenable number.

1087421 is a deficient number, since it is larger than the sum of its proper divisors (3331).

1087421 is an equidigital number, since it uses as much as digits as its factorization.

1087421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1087421 is about 1042.7948024420. The cubic root of 1087421 is about 102.8330156335.

The spelling of 1087421 in words is "one million, eighty-seven thousand, four hundred twenty-one".