123707990 has 64 divisors (see below), whose sum is σ = 264439296. Its totient is φ = 40787712.

The previous prime is 123707981. The next prime is 123707999. The reversal of 123707990 is 99707321.

It is an interprime number because it is at equal distance from previous prime (123707981) and next prime (123707999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123707999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219449 + ... + 220011.

It is an arithmetic number, because the mean of its divisors is an integer number (4131864).

Almost surely, 2^123707990 is an apocalyptic number.

123707990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123707990 is an abundant number, since it is smaller than the sum of its proper divisors (140731306).

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

123707990 is a wasteful number, since it uses less digits than its factorization.

123707990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 123707990 is about 11122.4093612850. The cubic root of 123707990 is about 498.2713504288.

The spelling of 123707990 in words is "one hundred twenty-three million, seven hundred seven thousand, nine hundred ninety".