1629431380 has 24 divisors (see below), whose sum is σ = 3422756232. Its totient is φ = 651591552.

The previous prime is 1629431359. The next prime is 1629431383. The reversal of 1629431380 is 831349261.

It can be written as a sum of positive squares in 4 ways, for example, as 581484996 + 1047946384 = 24114^2 + 32372^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1629431383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80794 + ... + 98926.

It is an arithmetic number, because the mean of its divisors is an integer number (142614843).

Almost surely, 2^1629431380 is an apocalyptic number.

1629431380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1629431380 is an abundant number, since it is smaller than the sum of its proper divisors (1793324852).

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

1629431380 is a wasteful number, since it uses less digits than its factorization.

1629431380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22635 (or 22633 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1629431380 is about 40366.2158246225. The cubic root of 1629431380 is about 1176.7350567170.

It can be divided in two parts, 16294 and 31380, that added together give a palindrome (47674).

The spelling of 1629431380 in words is "one billion, six hundred twenty-nine million, four hundred thirty-one thousand, three hundred eighty".