10991430 has 32 divisors (see below), whose sum is σ = 29311200. Its totient is φ = 2930976.

The previous prime is 10991429. The next prime is 10991459. The reversal of 10991430 is 3419901.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10991394 and 10991403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20085 + ... + 20624.

It is an arithmetic number, because the mean of its divisors is an integer number (915975).

Almost surely, 2^10991430 is an apocalyptic number.

10991430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10991430 is an abundant number, since it is smaller than the sum of its proper divisors (18319770).

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

10991430 is a wasteful number, since it uses less digits than its factorization.

10991430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40725 (or 40719 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 10991430 is about 3315.3325625041. The cubic root of 10991430 is about 222.3402379623.

The spelling of 10991430 in words is "ten million, nine hundred ninety-one thousand, four hundred thirty".