1299429440 has 28 divisors (see below), whose sum is σ = 3094267116. Its totient is φ = 519771648.

The previous prime is 1299429421. The next prime is 1299429451. The reversal of 1299429440 is 449249921.

It can be written as a sum of positive squares in 2 ways, for example, as 874739776 + 424689664 = 29576^2 + 20608^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1299429391 and 1299429400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030039 + ... + 2030678.

Almost surely, 2^1299429440 is an apocalyptic number.

1299429440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299429440 is an abundant number, since it is smaller than the sum of its proper divisors (1794837676).

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

1299429440 is an equidigital number, since it uses as much as digits as its factorization.

1299429440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060734 (or 4060724 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1299429440 is about 36047.5996426947. The cubic root of 1299429440 is about 1091.2331917160.

The spelling of 1299429440 in words is "one billion, two hundred ninety-nine million, four hundred twenty-nine thousand, four hundred forty".