40139642 has 8 divisors (see below), whose sum is σ = 60434100. Its totient is φ = 19994944.

The previous prime is 40139639. The next prime is 40139651. The reversal of 40139642 is 24693104.

It can be written as a sum of positive squares in 2 ways, for example, as 40081561 + 58081 = 6331^2 + 241^2 .

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

It is a super-2 number, since 2×40139642² = 3222381719776328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36767 + ... + 37842.

Almost surely, 2^40139642 is an apocalyptic number.

40139642 is a deficient number, since it is larger than the sum of its proper divisors (20294458).

40139642 is a wasteful number, since it uses less digits than its factorization.

40139642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74880.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 40139642 is about 6335.5853715343. The cubic root of 40139642 is about 342.3927012175.

The spelling of 40139642 in words is "forty million, one hundred thirty-nine thousand, six hundred forty-two".