101391720 has 64 divisors (see below), whose sum is σ = 306616320. Its totient is φ = 26820864.

The previous prime is 101391709. The next prime is 101391727. The reversal of 101391720 is 27193101.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (101391727) 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, 11914 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (4790880).

Almost surely, 2^101391720 is an apocalyptic number.

101391720 is a gapful number since it is divisible by the number (10) 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 101391720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153308160).

101391720 is an abundant number, since it is smaller than the sum of its proper divisors (205224600).

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

101391720 is a wasteful number, since it uses less digits than its factorization.

101391720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794 (or 6790 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 101391720 is about 10069.3455596677. The cubic root of 101391720 is about 466.3022347543.

The spelling of 101391720 in words is "one hundred one million, three hundred ninety-one thousand, seven hundred twenty".