40138645 has 8 divisors (see below), whose sum is σ = 49720320. Its totient is φ = 31074960.

The previous prime is 40138607. The next prime is 40138661. The reversal of 40138645 is 54683104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40138645 - 2¹⁷ = 40007573 is a prime.

It is a super-2 number, since 2×40138645² = 3222221644872050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129325 + ... + 129634.

It is an arithmetic number, because the mean of its divisors is an integer number (6215040).

Almost surely, 2^40138645 is an apocalyptic number.

It is an amenable number.

40138645 is a deficient number, since it is larger than the sum of its proper divisors (9581675).

40138645 is a wasteful number, since it uses less digits than its factorization.

40138645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258995.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 40138645 is about 6335.5066884978. The cubic root of 40138645 is about 342.3898663779.

The spelling of 40138645 in words is "forty million, one hundred thirty-eight thousand, six hundred forty-five".