6403749 has 16 divisors (see below), whose sum is σ = 9543744. Its totient is φ = 3785600.

The previous prime is 6403739. The next prime is 6403757. The reversal of 6403749 is 9473046.

It is a cyclic number.

It is not a de Polignac number, because 6403749 - 2⁸ = 6403493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1014 + ... + 3719.

It is an arithmetic number, because the mean of its divisors is an integer number (596484).

Almost surely, 2^6403749 is an apocalyptic number.

6403749 is the 1353-rd nonagonal number.

It is an amenable number.

6403749 is a deficient number, since it is larger than the sum of its proper divisors (3139995).

6403749 is a wasteful number, since it uses less digits than its factorization.

6403749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 6403749 is about 2530.5629808404. The cubic root of 6403749 is about 185.6997990109.

The spelling of 6403749 in words is "six million, four hundred three thousand, seven hundred forty-nine".