101191440 has 320 divisors, whose sum is σ = 388546560. Its totient is φ = 21288960.

The previous prime is 101191439. The next prime is 101191451. The reversal of 101191440 is 44191101.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1510287 + ... + 1510353.

It is an arithmetic number, because the mean of its divisors is an integer number (1214208).

Almost surely, 2^101191440 is an apocalyptic number.

101191440 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 101191440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194273280).

101191440 is an abundant number, since it is smaller than the sum of its proper divisors (287355120).

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

101191440 is a wasteful number, since it uses less digits than its factorization.

101191440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 101191440 is about 10059.3956080870. The cubic root of 101191440 is about 465.9950020033.

The spelling of 101191440 in words is "one hundred one million, one hundred ninety-one thousand, four hundred forty".