1239699853 has 6 divisors (see below), whose sum is σ = 1442099886. Its totient is φ = 1062599832.

The previous prime is 1239699841. The next prime is 1239699887. The reversal of 1239699853 is 3589969321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 766071684 + 473628169 = 27678^2 + 21763^2 .

It is not a de Polignac number, because 1239699853 - 2⁹ = 1239699341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1239699794 and 1239699803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239699893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12649950 + ... + 12650047.

It is an arithmetic number, because the mean of its divisors is an integer number (240349981).

Almost surely, 2^1239699853 is an apocalyptic number.

It is an amenable number.

1239699853 is a deficient number, since it is larger than the sum of its proper divisors (202400033).

1239699853 is an equidigital number, since it uses as much as digits as its factorization.

1239699853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25300011 (or 25300004 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 55.

The square root of 1239699853 is about 35209.3716643737. The cubic root of 1239699853 is about 1074.2503814541.

The spelling of 1239699853 in words is "one billion, two hundred thirty-nine million, six hundred ninety-nine thousand, eight hundred fifty-three".