90405749 has 4 divisors (see below), whose sum is σ = 103320864. Its totient is φ = 77490636.

The previous prime is 90405719. The next prime is 90405751. The reversal of 90405749 is 94750409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90405749 - 2⁸ = 90405493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90405719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6457547 + ... + 6457560.

It is an arithmetic number, because the mean of its divisors is an integer number (25830216).

Almost surely, 2^90405749 is an apocalyptic number.

It is an amenable number.

90405749 is a deficient number, since it is larger than the sum of its proper divisors (12915115).

90405749 is a wasteful number, since it uses less digits than its factorization.

90405749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12915114.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 90405749 is about 9508.1937822070. The cubic root of 90405749 is about 448.8129190207.

The spelling of 90405749 in words is "ninety million, four hundred five thousand, seven hundred forty-nine".