123997990 has 16 divisors (see below), whose sum is σ = 234943920. Its totient is φ = 46988640.

The previous prime is 123997969. The next prime is 123998011. The reversal of 123997990 is 99799321.

It is an interprime number because it is at equal distance from previous prime (123997969) and next prime (123998011).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326121 + ... + 326500.

It is an arithmetic number, because the mean of its divisors is an integer number (14683995).

Almost surely, 2^123997990 is an apocalyptic number.

123997990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123997990 is a deficient number, since it is larger than the sum of its proper divisors (110945930).

123997990 is a wasteful number, since it uses less digits than its factorization.

123997990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652647.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 123997990 is about 11135.4384736300. The cubic root of 123997990 is about 498.6604008200.

The spelling of 123997990 in words is "one hundred twenty-three million, nine hundred ninety-seven thousand, nine hundred ninety".