1191400725 has 24 divisors (see below), whose sum is σ = 1991926080. Its totient is φ = 628270720.

The previous prime is 1191400723. The next prime is 1191400729. The reversal of 1191400725 is 5270041911.

It is not a de Polignac number, because 1191400725 - 2¹ = 1191400723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1191400692 and 1191400701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191400723) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 82569 + ... + 95918.

It is an arithmetic number, because the mean of its divisors is an integer number (82996920).

Almost surely, 2^1191400725 is an apocalyptic number.

1191400725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191400725 is a deficient number, since it is larger than the sum of its proper divisors (800525355).

1191400725 is a wasteful number, since it uses less digits than its factorization.

1191400725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178589 (or 178584 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1191400725 is about 34516.6731450179. The cubic root of 1191400725 is about 1060.1141223396.

The spelling of 1191400725 in words is "one billion, one hundred ninety-one million, four hundred thousand, seven hundred twenty-five".