40390000 has 100 divisors (see below), whose sum is σ = 111951664. Its totient is φ = 13824000.

The previous prime is 40389997. The next prime is 40390003. The reversal of 40390000 is 9304.

It is an interprime number because it is at equal distance from previous prime (40389997) and next prime (40390003).

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40390003) 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 19 ways as a sum of consecutive naturals, for example, 69712 + ... + 70288.

Almost surely, 2^40390000 is an apocalyptic number.

40390000 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 40390000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55975832).

40390000 is an abundant number, since it is smaller than the sum of its proper divisors (71561664).

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

40390000 is an equidigital number, since it uses as much as digits as its factorization.

40390000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 40390000 is about 6355.3127381743. The cubic root of 40390000 is about 343.1030808170.

Adding to 40390000 its reverse (9304), we get a palindrome (40399304).

The spelling of 40390000 in words is "forty million, three hundred ninety thousand".