40389516 has 78 divisors (see below), whose sum is σ = 111602540. Its totient is φ = 12754584.

The previous prime is 40389511. The next prime is 40389521. The reversal of 40389516 is 61598304.

It is an interprime number because it is at equal distance from previous prime (40389511) and next prime (40389521).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 3 and base 9.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (40389511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 25 ways as a sum of consecutive naturals, for example, 2125755 + ... + 2125773.

Almost surely, 2^40389516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40389516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55801270).

40389516 is an abundant number, since it is smaller than the sum of its proper divisors (71213024).

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

40389516 is an frugal number, since it uses more digits than its factorization.

40389516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 24 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 40389516 is about 6355.2746596823. The cubic root of 40389516 is about 343.1017103246.

The spelling of 40389516 in words is "forty million, three hundred eighty-nine thousand, five hundred sixteen".