33920040 has 128 divisors (see below), whose sum is σ = 126904320. Its totient is φ = 7046400.

The previous prime is 33920039. The next prime is 33920057. The reversal of 33920040 is 4002933.

It is a super-2 number, since 2×33920040² = 2301138227203200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 33919989 and 33920016.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7405 + ... + 11075.

It is an arithmetic number, because the mean of its divisors is an integer number (991440).

Almost surely, 2^33920040 is an apocalyptic number.

33920040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33920040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63452160).

33920040 is an abundant number, since it is smaller than the sum of its proper divisors (92984280).

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

33920040 is a wasteful number, since it uses less digits than its factorization.

33920040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703 (or 3699 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 33920040 is about 5824.0913454375. The cubic root of 33920040 is about 323.7070206259.

Adding to 33920040 its reverse (4002933), we get a palindrome (37922973).

The spelling of 33920040 in words is "thirty-three million, nine hundred twenty thousand, forty".