40742172 has 18 divisors (see below), whose sum is σ = 102987248. Its totient is φ = 13580712.

The previous prime is 40742171. The next prime is 40742197. The reversal of 40742172 is 27124704.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40742171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565828 + ... + 565899.

Almost surely, 2^40742172 is an apocalyptic number.

It is an amenable number.

40742172 is an abundant number, since it is smaller than the sum of its proper divisors (62245076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40742172 is a wasteful number, since it uses less digits than its factorization.

40742172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131737 (or 1131732 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 40742172 is about 6382.9595016732. The cubic root of 40742172 is about 344.0974012093.

Adding to 40742172 its reverse (27124704), we get a palindrome (67866876).

The spelling of 40742172 in words is "forty million, seven hundred forty-two thousand, one hundred seventy-two".