406859381 has 4 divisors (see below), whose sum is σ = 407475564. Its totient is φ = 406243200.

The previous prime is 406859371. The next prime is 406859417. The reversal of 406859381 is 183958604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 230766481 + 176092900 = 15191^2 + 13270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406859381 is a prime.

It is a super-2 number, since 2×406859381² = 331069111815406322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406859371) 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, 307100 + ... + 308421.

It is an arithmetic number, because the mean of its divisors is an integer number (101868891).

Almost surely, 2^406859381 is an apocalyptic number.

It is an amenable number.

406859381 is a deficient number, since it is larger than the sum of its proper divisors (616183).

406859381 is an equidigital number, since it uses as much as digits as its factorization.

406859381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616182.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 406859381 is about 20170.7555882272. The cubic root of 406859381 is about 740.9941477510.

The spelling of 406859381 in words is "four hundred six million, eight hundred fifty-nine thousand, three hundred eighty-one".