1318720429 has 16 divisors (see below), whose sum is σ = 1431430000. Its totient is φ = 1207664640.

The previous prime is 1318720397. The next prime is 1318720457. The reversal of 1318720429 is 9240278131.

It can be written as a sum of positive squares in 8 ways, for example, as 67683529 + 1251036900 = 8227^2 + 35370^2 .

It is not a de Polignac number, because 1318720429 - 2⁵ = 1318720397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318720829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1055197 + ... + 1056445.

It is an arithmetic number, because the mean of its divisors is an integer number (89464375).

Almost surely, 2^1318720429 is an apocalyptic number.

It is an amenable number.

1318720429 is a deficient number, since it is larger than the sum of its proper divisors (112709571).

1318720429 is a wasteful number, since it uses less digits than its factorization.

1318720429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1318720429 is about 36314.1904632335. The cubic root of 1318720429 is about 1096.6067413766.

The spelling of 1318720429 in words is "one billion, three hundred eighteen million, seven hundred twenty thousand, four hundred twenty-nine".