49491765 has 12 divisors (see below), whose sum is σ = 85785804. Its totient is φ = 26395584.

The previous prime is 49491721. The next prime is 49491769. The reversal of 49491765 is 56719494.

49491765 is a `hidden beast` number, since 494 + 91 + 76 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 26967249 = 4746^2 + 5193^2 .

It is not a de Polignac number, because 49491765 - 2¹¹ = 49489717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1099817 = 49491765 / (4 + 9 + 4 + 9 + 1 + 7 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 49491765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49491769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549864 + ... + 549953.

It is an arithmetic number, because the mean of its divisors is an integer number (7148817).

Almost surely, 2^49491765 is an apocalyptic number.

49491765 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

49491765 is a deficient number, since it is larger than the sum of its proper divisors (36294039).

49491765 is a wasteful number, since it uses less digits than its factorization.

49491765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099828 (or 1099825 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 49491765 is about 7035.0383794262. The cubic root of 49491765 is about 367.1506606711.

The spelling of 49491765 in words is "forty-nine million, four hundred ninety-one thousand, seven hundred sixty-five".