11420840 has 16 divisors (see below), whose sum is σ = 25696980. Its totient is φ = 4568320.

The previous prime is 11420819. The next prime is 11420861. The reversal of 11420840 is 4802411.

It is an interprime number because it is at equal distance from previous prime (11420819) and next prime (11420861).

It can be written as a sum of positive squares in 2 ways, for example, as 10982596 + 438244 = 3314^2 + 662^2 .

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

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, 142721 + ... + 142800.

Almost surely, 2^11420840 is an apocalyptic number.

11420840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11420840 is an abundant number, since it is smaller than the sum of its proper divisors (14276140).

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

11420840 is a wasteful number, since it uses less digits than its factorization.

11420840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285532 (or 285528 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 11420840 is about 3379.4733317486. The cubic root of 11420840 is about 225.1987708510.

The spelling of 11420840 in words is "eleven million, four hundred twenty thousand, eight hundred forty".