1001191400 has 96 divisors (see below), whose sum is σ = 2547024480. Its totient is φ = 362976000.

The previous prime is 1001191397. The next prime is 1001191427. The reversal of 1001191400 is 41911001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1255802 + ... + 1256598.

It is an arithmetic number, because the mean of its divisors is an integer number (26531505).

Almost surely, 2^1001191400 is an apocalyptic number.

1001191400 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 1001191400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273512240).

1001191400 is an abundant number, since it is smaller than the sum of its proper divisors (1545833080).

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

1001191400 is a wasteful number, since it uses less digits than its factorization.

1001191400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395 (or 1386 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1001191400 is about 31641.6086822399. The cubic root of 1001191400 is about 1000.3969757228.

The spelling of 1001191400 in words is "one billion, one million, one hundred ninety-one thousand, four hundred".