1400021 has 4 divisors (see below), whose sum is σ = 1600032. Its totient is φ = 1200012.

The previous prime is 1400017. The next prime is 1400023. The reversal of 1400021 is 1200041.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1200041 = 31 ⋅38711.

It is a cyclic number.

It is not a de Polignac number, because 1400021 - 2² = 1400017 is a prime.

1400021 is a modest number, since divided by 21 gives 14 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1399981 and 1400008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400023) 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, 99995 + ... + 100008.

It is an arithmetic number, because the mean of its divisors is an integer number (400008).

2^1400021 is an apocalyptic number.

It is an amenable number.

1400021 is a deficient number, since it is larger than the sum of its proper divisors (200011).

1400021 is an equidigital number, since it uses as much as digits as its factorization.

1400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1400021 is about 1183.2248307063. The cubic root of 1400021 is about 111.8694535498.

Adding to 1400021 its reverse (1200041), we get a palindrome (2600062).

The spelling of 1400021 in words is "one million, four hundred thousand, twenty-one".