23979780 has 144 divisors (see below), whose sum is σ = 82225920. Its totient is φ = 5797440.

The previous prime is 23979757. The next prime is 23979803. The reversal of 23979780 is 8797932.

It is an interprime number because it is at equal distance from previous prime (23979757) and next prime (23979803).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 65157 + ... + 65523.

Almost surely, 2^23979780 is an apocalyptic number.

23979780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23979780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41112960).

23979780 is an abundant number, since it is smaller than the sum of its proper divisors (58246140).

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

23979780 is a wasteful number, since it uses less digits than its factorization.

23979780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 23979780 is about 4896.9153556091. The cubic root of 23979780 is about 288.3688849507.

The spelling of 23979780 in words is "twenty-three million, nine hundred seventy-nine thousand, seven hundred eighty".