1299281652 has 18 divisors (see below), whose sum is σ = 3284295378. Its totient is φ = 433093872.

The previous prime is 1299281629. The next prime is 1299281699. The reversal of 1299281652 is 2561829921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 871784676 + 427496976 = 29526^2 + 20676^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1299281652² = 3376265622447698208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1299281598 and 1299281607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18045543 + ... + 18045614.

Almost surely, 2^1299281652 is an apocalyptic number.

1299281652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1299281652 is an abundant number, since it is smaller than the sum of its proper divisors (1985013726).

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

1299281652 is a wasteful number, since it uses less digits than its factorization.

1299281652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36091167 (or 36091162 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1299281652 is about 36045.5496836988. The cubic root of 1299281652 is about 1091.1918204084.

The spelling of 1299281652 in words is "one billion, two hundred ninety-nine million, two hundred eighty-one thousand, six hundred fifty-two".