1247421 has 16 divisors (see below), whose sum is σ = 1916928. Its totient is φ = 706800.

The previous prime is 1247419. The next prime is 1247429.

It is a happy number.

1247421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1247421 - 2¹ = 1247419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1247421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3856 + ... + 4166.

It is an arithmetic number, because the mean of its divisors is an integer number (119808).

2^1247421 is an apocalyptic number.

It is an amenable number.

1247421 is a deficient number, since it is larger than the sum of its proper divisors (669507).

1247421 is a wasteful number, since it uses less digits than its factorization.

1247421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 448, while the sum is 21.

The square root of 1247421 is about 1116.8800293675. The cubic root of 1247421 is about 107.6475996657.

The spelling of 1247421 in words is "one million, two hundred forty-seven thousand, four hundred twenty-one".