90406369 has 4 divisors (see below), whose sum is σ = 93523860. Its totient is φ = 87288880.

The previous prime is 90406321. The next prime is 90406387. The reversal of 90406369 is 96360409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96360409 = 23 ⋅4189583.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 32341969 = 7620^2 + 5687^2 .

It is a cyclic number.

It is not a de Polignac number, because 90406369 - 2¹³ = 90398177 is a prime.

It is a super-2 number, since 2×90406369² = 16346623111528322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90406319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1558702 + ... + 1558759.

It is an arithmetic number, because the mean of its divisors is an integer number (23380965).

Almost surely, 2^90406369 is an apocalyptic number.

It is an amenable number.

90406369 is a deficient number, since it is larger than the sum of its proper divisors (3117491).

90406369 is a wasteful number, since it uses less digits than its factorization.

90406369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117490.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 90406369 is about 9508.2263856095. The cubic root of 90406369 is about 448.8139450004.

The spelling of 90406369 in words is "ninety million, four hundred six thousand, three hundred sixty-nine".