40921040 has 40 divisors (see below), whose sum is σ = 100741320. Its totient is φ = 15405056.

The previous prime is 40921039. The next prime is 40921061. The reversal of 40921040 is 4012904.

It can be written as a sum of positive squares in 4 ways, for example, as 8248384 + 32672656 = 2872^2 + 5716^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

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, 13685 + ... + 16404.

It is an arithmetic number, because the mean of its divisors is an integer number (2518533).

Almost surely, 2^40921040 is an apocalyptic number.

40921040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40921040 is an abundant number, since it is smaller than the sum of its proper divisors (59820280).

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

40921040 is a wasteful number, since it uses less digits than its factorization.

40921040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30119 (or 30113 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 40921040 is about 6396.9555258732. The cubic root of 40921040 is about 344.6002230583.

Adding to 40921040 its reverse (4012904), we get a palindrome (44933944).

The spelling of 40921040 in words is "forty million, nine hundred twenty-one thousand, forty".