23418397840 has 40 divisors (see below), whose sum is σ = 56325290040. Its totient is φ = 9044345856.

The previous prime is 23418397789. The next prime is 23418397841. The reversal of 23418397840 is 4879381432.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60777616 + 23357620224 = 7796^2 + 152832^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (23418397841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5044749 + ... + 5049388.

It is an arithmetic number, because the mean of its divisors is an integer number (1408132251).

Almost surely, 2^23418397840 is an apocalyptic number.

23418397840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23418397840 is an abundant number, since it is smaller than the sum of its proper divisors (32906892200).

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

23418397840 is a wasteful number, since it uses less digits than its factorization.

23418397840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10094179 (or 10094173 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 23418397840 in words is "twenty-three billion, four hundred eighteen million, three hundred ninety-seven thousand, eight hundred forty".