8390357840 has 40 divisors (see below), whose sum is σ = 19686571080. Its totient is φ = 3325349376.

The previous prime is 8390357831. The next prime is 8390357849. The reversal of 8390357840 is 487530938.

It is an interprime number because it is at equal distance from previous prime (8390357831) and next prime (8390357849).

It can be written as a sum of positive squares in 4 ways, for example, as 19571776 + 8370786064 = 4424^2 + 91492^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8390357849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472379 + ... + 489818.

It is an arithmetic number, because the mean of its divisors is an integer number (492164277).

Almost surely, 2^8390357840 is an apocalyptic number.

8390357840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8390357840 is an abundant number, since it is smaller than the sum of its proper divisors (11296213240).

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

8390357840 is a wasteful number, since it uses less digits than its factorization.

8390357840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962319 (or 962313 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 8390357840 is about 91598.8964999033. The cubic root of 8390357840 is about 2032.0146177157.

The spelling of 8390357840 in words is "eight billion, three hundred ninety million, three hundred fifty-seven thousand, eight hundred forty".