239797440 has 168 divisors, whose sum is σ = 840900528. Its totient is φ = 62699520.

The previous prime is 239797421. The next prime is 239797447. The reversal of 239797440 is 44797932.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (239797447) 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, 151855 + ... + 153425.

Almost surely, 2^239797440 is an apocalyptic number.

239797440 is a gapful number since it is divisible by the number (20) 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 239797440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420450264).

239797440 is an abundant number, since it is smaller than the sum of its proper divisors (601103088).

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

239797440 is a wasteful number, since it uses less digits than its factorization.

239797440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 239797440 is about 15485.3944089261. The cubic root of 239797440 is about 621.2716183655.

The spelling of 239797440 in words is "two hundred thirty-nine million, seven hundred ninety-seven thousand, four hundred forty".