23195640 has 64 divisors (see below), whose sum is σ = 74944800. Its totient is φ = 5709312.

The previous prime is 23195611. The next prime is 23195647. The reversal of 23195640 is 4659132.

23195640 = 225² + 226² + ... + 432².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23195598 and 23195607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23195647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5875 + ... + 8994.

Almost surely, 2^23195640 is an apocalyptic number.

23195640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23195640 is an abundant number, since it is smaller than the sum of its proper divisors (51749160).

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

23195640 is a wasteful number, since it uses less digits than its factorization.

23195640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14896 (or 14892 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 23195640 is about 4816.1852123854. The cubic root of 23195640 is about 285.1907617915.

The spelling of 23195640 in words is "twenty-three million, one hundred ninety-five thousand, six hundred forty".