2495139840 has 156 divisors (see below), whose sum is σ = 8649401124. Its totient is φ = 665321472.

The previous prime is 2495139821. The next prime is 2495139863. The reversal of 2495139840 is 489315942.

2495139840 is a `hidden beast` number, since 2 + 4 + 9 + 513 + 98 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1833209856 + 661929984 = 42816^2 + 25728^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177552 + ... + 191088.

It is an arithmetic number, because the mean of its divisors is an integer number (55444879).

Almost surely, 2^2495139840 is an apocalyptic number.

2495139840 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 2495139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4324700562).

2495139840 is an abundant number, since it is smaller than the sum of its proper divisors (6154261284).

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

2495139840 is a wasteful number, since it uses less digits than its factorization.

2495139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13572 (or 13547 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 2495139840 is about 49951.3747558563. The cubic root of 2495139840 is about 1356.3287374846.

The spelling of 2495139840 in words is "two billion, four hundred ninety-five million, one hundred thirty-nine thousand, eight hundred forty".