123778992 has 20 divisors (see below), whose sum is σ = 319762520. Its totient is φ = 41259648.

The previous prime is 123778987. The next prime is 123778997. The reversal of 123778992 is 299877321.

It is an interprime number because it is at equal distance from previous prime (123778987) and next prime (123778997).

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 2578729 = 123778992 / (1 + 2 + 3 + 7 + 7 + 8 + 9 + 9 + 2).

It is not an unprimeable number, because it can be changed into a prime (123778997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289317 + ... + 1289412.

It is an arithmetic number, because the mean of its divisors is an integer number (15988126).

Almost surely, 2^123778992 is an apocalyptic number.

123778992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123778992 is an abundant number, since it is smaller than the sum of its proper divisors (195983528).

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

123778992 is a wasteful number, since it uses less digits than its factorization.

123778992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578740 (or 2578734 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 123778992 is about 11125.6007478248. The cubic root of 123778992 is about 498.3666595411.

The spelling of 123778992 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, nine hundred ninety-two".