406138731 has 8 divisors (see below), whose sum is σ = 541688784. Its totient is φ = 270673920.

The previous prime is 406138693. The next prime is 406138753. The reversal of 406138731 is 137831604.

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

It is not a de Polignac number, because 406138731 - 2⁹ = 406138219 is a prime.

It is a super-2 number, since 2×406138731² = 329897337636580722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 406138692 and 406138701.

It is not an unprimeable number, because it can be changed into a prime (406133731) 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, 9210 + ... + 29951.

It is an arithmetic number, because the mean of its divisors is an integer number (67711098).

Almost surely, 2^406138731 is an apocalyptic number.

406138731 is a deficient number, since it is larger than the sum of its proper divisors (135550053).

406138731 is a wasteful number, since it uses less digits than its factorization.

406138731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42621.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 406138731 is about 20152.8839375410. The cubic root of 406138731 is about 740.5563937020.

The spelling of 406138731 in words is "four hundred six million, one hundred thirty-eight thousand, seven hundred thirty-one".