1431720 has 96 divisors (see below), whose sum is σ = 4815720. Its totient is φ = 368640.

The previous prime is 1431713. The next prime is 1431721. The reversal of 1431720 is 271341.

It can be written as a sum of positive squares in 4 ways, for example, as 736164 + 695556 = 858^2 + 834^2 .

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 = 1431693 and 1431702.

It is not an unprimeable number, because it can be changed into a prime (1431721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14712 + ... + 14808.

2^1431720 is an apocalyptic number.

1431720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1431720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2407860).

1431720 is an abundant number, since it is smaller than the sum of its proper divisors (3384000).

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

1431720 is a wasteful number, since it uses less digits than its factorization.

1431720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1431720 is about 1196.5450263153. The cubic root of 1431720 is about 112.7074690087.

The spelling of 1431720 in words is "one million, four hundred thirty-one thousand, seven hundred twenty".