123849797929 has 81 divisors (see below), whose sum is σ = 155551060119. Its totient is φ = 98482132320.

The previous prime is 123849797899. The next prime is 123849797933. The reversal of 123849797929 is 929797948321.

The square root of 123849797929 is 351923.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18320976025 + 105528821904 = 135355^2 + 324852^2 .

It is not a de Polignac number, because 123849797929 - 2⁷ = 123849797801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123849797989) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1157474694 + ... + 1157474800.

Almost surely, 2^123849797929 is an apocalyptic number.

123849797929 is the 351923-rd square number.

123849797929 is the 175962-nd centered octagonal number.

It is an amenable number.

123849797929 is a deficient number, since it is larger than the sum of its proper divisors (31701262190).

123849797929 is a wasteful number, since it uses less digits than its factorization.

123849797929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 154 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 70.

The spelling of 123849797929 in words is "one hundred twenty-three billion, eight hundred forty-nine million, seven hundred ninety-seven thousand, nine hundred twenty-nine".