11921240 has 16 divisors (see below), whose sum is σ = 26822880. Its totient is φ = 4768480.

The previous prime is 11921219. The next prime is 11921251. The reversal of 11921240 is 4212911.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148976 + ... + 149055.

It is an arithmetic number, because the mean of its divisors is an integer number (1676430).

Almost surely, 2^11921240 is an apocalyptic number.

11921240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11921240 is an abundant number, since it is smaller than the sum of its proper divisors (14901640).

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

11921240 is a wasteful number, since it uses less digits than its factorization.

11921240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298042 (or 298038 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 11921240 is about 3452.7148738348. The cubic root of 11921240 is about 228.4408726156.

The spelling of 11921240 in words is "eleven million, nine hundred twenty-one thousand, two hundred forty".