40026389 has 4 divisors (see below), whose sum is σ = 43105356. Its totient is φ = 36947424.

The previous prime is 40026383. The next prime is 40026419. The reversal of 40026389 is 98362004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20295025 + 19731364 = 4505^2 + 4442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40026389 is a prime.

It is a super-2 number, since 2×40026389² = 3204223632758642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40026383) 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, 1539464 + ... + 1539489.

It is an arithmetic number, because the mean of its divisors is an integer number (10776339).

Almost surely, 2^40026389 is an apocalyptic number.

It is an amenable number.

40026389 is a deficient number, since it is larger than the sum of its proper divisors (3078967).

40026389 is a wasteful number, since it uses less digits than its factorization.

40026389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078966.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40026389 is about 6326.6412099944. The cubic root of 40026389 is about 342.0703803947.

The spelling of 40026389 in words is "forty million, twenty-six thousand, three hundred eighty-nine".