49239840 has 144 divisors (see below), whose sum is σ = 168231168. Its totient is φ = 12100608.

The previous prime is 49239829. The next prime is 49239851. The reversal of 49239840 is 4893294.

It is an interprime number because it is at equal distance from previous prime (49239829) and next prime (49239851).

It is a Smith number, since the sum of its digits (39) 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 (39).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80817 + ... + 81423.

It is an arithmetic number, because the mean of its divisors is an integer number (1168272).

Almost surely, 2^49239840 is an apocalyptic number.

49239840 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 49239840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84115584).

49239840 is an abundant number, since it is smaller than the sum of its proper divisors (118991328).

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

49239840 is a wasteful number, since it uses less digits than its factorization.

49239840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 49239840 is about 7017.1105164448. The cubic root of 49239840 is about 366.5266389094.

The spelling of 49239840 in words is "forty-nine million, two hundred thirty-nine thousand, eight hundred forty".