33401220 has 24 divisors (see below), whose sum is σ = 93523584. Its totient is φ = 8906976.

The previous prime is 33401219. The next prime is 33401233. The reversal of 33401220 is 2210433.

It is a super-2 number, since 2×33401220² = 2231282994976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 33401220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278284 + ... + 278403.

It is an arithmetic number, because the mean of its divisors is an integer number (3896816).

Almost surely, 2^33401220 is an apocalyptic number.

33401220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33401220 is an abundant number, since it is smaller than the sum of its proper divisors (60122364).

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

33401220 is a wasteful number, since it uses less digits than its factorization.

33401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556699 (or 556697 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 33401220 is about 5779.3788593585. The cubic root of 33401220 is about 322.0481262377.

Adding to 33401220 its reverse (2210433), we get a palindrome (35611653).

It can be divided in two parts, 3340 and 1220, that added together give a triangular number (4560 = T₉₅).

The spelling of 33401220 in words is "thirty-three million, four hundred one thousand, two hundred twenty".