245537840 has 20 divisors (see below), whose sum is σ = 570875664. Its totient is φ = 98215104.

The previous prime is 245537827. The next prime is 245537843. The reversal of 245537840 is 48735542.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 245537794 and 245537803.

It is not an unprimeable number, because it can be changed into a prime (245537843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534532 + ... + 1534691.

Almost surely, 2^245537840 is an apocalyptic number.

245537840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245537840 is an abundant number, since it is smaller than the sum of its proper divisors (325337824).

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

245537840 is a wasteful number, since it uses less digits than its factorization.

245537840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069236 (or 3069230 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

The square root of 245537840 is about 15669.6470923885. The cubic root of 245537840 is about 626.1900228482.

The spelling of 245537840 in words is "two hundred forty-five million, five hundred thirty-seven thousand, eight hundred forty".