1400724 has 72 divisors (see below), whose sum is σ = 3959592. Its totient is φ = 414720.

The previous prime is 1400701. The next prime is 1400731. The reversal of 1400724 is 4270041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3600 + 1397124 = 60^2 + 1182^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1400697 and 1400706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19152 + ... + 19224.

2^1400724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1400724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1979796).

1400724 is an abundant number, since it is smaller than the sum of its proper divisors (2558868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1400724 is a wasteful number, since it uses less digits than its factorization.

1400724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1400724 is about 1183.5218629159. The cubic root of 1400724 is about 111.8881749514. Note that the first 3 decimals are identical.

Adding to 1400724 its reverse (4270041), we get a palindrome (5670765).

The spelling of 1400724 in words is "one million, four hundred thousand, seven hundred twenty-four".