40651920 has 120 divisors (see below), whose sum is σ = 137884032. Its totient is φ = 10732800.

The previous prime is 40651889. The next prime is 40651921. The reversal of 40651920 is 2915604.

40651920 is a `hidden beast` number, since 4 + 0 + 651 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (40651921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94105 + ... + 94535.

Almost surely, 2^40651920 is an apocalyptic number.

40651920 is a gapful number since it is divisible by the number (40) 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 40651920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68942016).

40651920 is an abundant number, since it is smaller than the sum of its proper divisors (97232112).

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

40651920 is a wasteful number, since it uses less digits than its factorization.

40651920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 40651920 is about 6375.8858208095. The cubic root of 40651920 is about 343.8431320107.

It can be divided in two parts, 406 and 51920, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 40651920 in words is "forty million, six hundred fifty-one thousand, nine hundred twenty".