40072429 has 4 divisors (see below), whose sum is σ = 41365120. Its totient is φ = 38779740.

The previous prime is 40072427. The next prime is 40072441. The reversal of 40072429 is 92427004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40072429 - 2¹ = 40072427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40072397 and 40072406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40072427) 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, 646299 + ... + 646360.

It is an arithmetic number, because the mean of its divisors is an integer number (10341280).

Almost surely, 2^40072429 is an apocalyptic number.

It is an amenable number.

40072429 is a deficient number, since it is larger than the sum of its proper divisors (1292691).

40072429 is a wasteful number, since it uses less digits than its factorization.

40072429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292690.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40072429 is about 6330.2787458373. The cubic root of 40072429 is about 342.2014846171.

The spelling of 40072429 in words is "forty million, seventy-two thousand, four hundred twenty-nine".