1420724 has 18 divisors (see below), whose sum is σ = 2643270. Its totient is φ = 668032.

The previous prime is 1420721. The next prime is 1420729. The reversal of 1420724 is 4270241.

It can be written as a sum of positive squares in 3 ways, for example, as 1036324 + 384400 = 1018^2 + 620^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1420696 and 1420705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 542 + ... + 1770.

2^1420724 is an apocalyptic number.

It is an amenable number.

1420724 is a deficient number, since it is larger than the sum of its proper divisors (1222546).

1420724 is a wasteful number, since it uses less digits than its factorization.

1420724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1420724 is about 1191.9412737212. The cubic root of 1420724 is about 112.4181857835.

Adding to 1420724 its reverse (4270241), we get a palindrome (5690965).

The spelling of 1420724 in words is "one million, four hundred twenty thousand, seven hundred twenty-four".