40047749 has 24 divisors (see below), whose sum is σ = 48454560. Its totient is φ = 32979744.

The previous prime is 40047731. The next prime is 40047751. The reversal of 40047749 is 94774004.

40047749 = 36² + 37² + ... + 493².

It is a de Polignac number, because none of the positive numbers 2^k-40047749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40047779) 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, 174767 + ... + 174995.

It is an arithmetic number, because the mean of its divisors is an integer number (2018940).

Almost surely, 2^40047749 is an apocalyptic number.

40047749 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

40047749 is a deficient number, since it is larger than the sum of its proper divisors (8406811).

40047749 is a wasteful number, since it uses less digits than its factorization.

40047749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 40047749 is about 6328.3290843634. The cubic root of 40047749 is about 342.1312179586.

The spelling of 40047749 in words is "forty million, forty-seven thousand, seven hundred forty-nine".