11721402 has 64 divisors (see below), whose sum is σ = 32486400. Its totient is φ = 3043440.

The previous prime is 11721397. The next prime is 11721407. The reversal of 11721402 is 20412711.

It is an interprime number because it is at equal distance from previous prime (11721397) and next prime (11721407).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (11721407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2749 + ... + 5567.

It is an arithmetic number, because the mean of its divisors is an integer number (507600).

Almost surely, 2^11721402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11721402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16243200).

11721402 is an abundant number, since it is smaller than the sum of its proper divisors (20764998).

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

11721402 is a wasteful number, since it uses less digits than its factorization.

11721402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 11721402 is about 3423.6533118878. The cubic root of 11721402 is about 227.1572070474.

The spelling of 11721402 in words is "eleven million, seven hundred twenty-one thousand, four hundred two".