1400921 has 4 divisors (see below), whose sum is σ = 1446144. Its totient is φ = 1355700.

The previous prime is 1400899. The next prime is 1400923. The reversal of 1400921 is 1290041.

It is a happy number.

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: 1290041 = 227 ⋅5683.

It is a cyclic number.

It is not a de Polignac number, because 1400921 - 2¹⁸ = 1138777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1400921.

It is not an unprimeable number, because it can be changed into a prime (1400923) 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, 22565 + ... + 22626.

It is an arithmetic number, because the mean of its divisors is an integer number (361536).

2^1400921 is an apocalyptic number.

It is an amenable number.

1400921 is a deficient number, since it is larger than the sum of its proper divisors (45223).

1400921 is an equidigital number, since it uses as much as digits as its factorization.

1400921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45222.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1400921 is about 1183.6050861668. The cubic root of 1400921 is about 111.8934200811.

Adding to 1400921 its reverse (1290041), we get a palindrome (2690962).

The spelling of 1400921 in words is "one million, four hundred thousand, nine hundred twenty-one".