40138977 has 8 divisors (see below), whose sum is σ = 54252064. Its totient is φ = 26392608.

The previous prime is 40138957. The next prime is 40138991. The reversal of 40138977 is 77983104.

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

It is not a de Polignac number, because 40138977 - 2¹² = 40134881 is a prime.

It is a super-2 number, since 2×40138977² = 3222274949213058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40138937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91423 + ... + 91860.

It is an arithmetic number, because the mean of its divisors is an integer number (6781508).

Almost surely, 2^40138977 is an apocalyptic number.

It is an amenable number.

40138977 is a deficient number, since it is larger than the sum of its proper divisors (14113087).

40138977 is a wasteful number, since it uses less digits than its factorization.

40138977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183359.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 40138977 is about 6335.5328899786. The cubic root of 40138977 is about 342.3908103818.

The spelling of 40138977 in words is "forty million, one hundred thirty-eight thousand, nine hundred seventy-seven".