123649897 has 16 divisors (see below), whose sum is σ = 145057792. Its totient is φ = 103194000.

The previous prime is 123649871. The next prime is 123649919. The reversal of 123649897 is 798946321.

It is a de Polignac number, because none of the positive numbers 2^k-123649897 is a prime.

It is a super-2 number, since 2×123649897² = 30578594056221218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123649897.

It is not an unprimeable number, because it can be changed into a prime (123649697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164272 + ... + 165022.

It is an arithmetic number, because the mean of its divisors is an integer number (9066112).

Almost surely, 2^123649897 is an apocalyptic number.

It is an amenable number.

123649897 is a deficient number, since it is larger than the sum of its proper divisors (21407895).

123649897 is an equidigital number, since it uses as much as digits as its factorization.

123649897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348.

The product of its digits is 653184, while the sum is 49.

The square root of 123649897 is about 11119.7975251351. The cubic root of 123649897 is about 498.1933425067.

The spelling of 123649897 in words is "one hundred twenty-three million, six hundred forty-nine thousand, eight hundred ninety-seven".