1431229644 has 144 divisors (see below), whose sum is σ = 4160782080. Its totient is φ = 411143040.

The previous prime is 1431229621. The next prime is 1431229697. The reversal of 1431229644 is 4469221341.

1431229644 is a `hidden beast` number, since 1 + 4 + 3 + 1 + 2 + 2 + 9 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1431229599 and 1431229608.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 630199 + ... + 632465.

It is an arithmetic number, because the mean of its divisors is an integer number (28894320).

Almost surely, 2^1431229644 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 1431229644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080391040).

1431229644 is an abundant number, since it is smaller than the sum of its proper divisors (2729552436).

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

1431229644 is a wasteful number, since it uses less digits than its factorization.

1431229644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380 (or 2375 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 1431229644 is about 37831.5958426287. The cubic root of 1431229644 is about 1126.9460031599.

It can be divided in two parts, 14312 and 29644, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 1431229644 in words is "one billion, four hundred thirty-one million, two hundred twenty-nine thousand, six hundred forty-four".