40389331 has 4 divisors (see below), whose sum is σ = 42765192. Its totient is φ = 38013472.

The previous prime is 40389319. The next prime is 40389337. The reversal of 40389331 is 13398304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40389331 - 2⁵ = 40389299 is a prime.

It is a super-2 number, since 2×40389331² = 3262596117255122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40389293 and 40389302.

It is not an unprimeable number, because it can be changed into a prime (40389337) 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, 1187905 + ... + 1187938.

It is an arithmetic number, because the mean of its divisors is an integer number (10691298).

Almost surely, 2^40389331 is an apocalyptic number.

40389331 is a deficient number, since it is larger than the sum of its proper divisors (2375861).

40389331 is a wasteful number, since it uses less digits than its factorization.

40389331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375860.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 40389331 is about 6355.2601048266. The cubic root of 40389331 is about 343.1011864765.

The spelling of 40389331 in words is "forty million, three hundred eighty-nine thousand, three hundred thirty-one".