406401493 has 2 divisors, whose sum is σ = 406401494. Its totient is φ = 406401492.

The previous prime is 406401481. The next prime is 406401511. The reversal of 406401493 is 394104604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259918884 + 146482609 = 16122^2 + 12103^2 .

It is a cyclic number.

It is not a de Polignac number, because 406401493 - 2²⁵ = 372847061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406401893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203200746 + 203200747.

It is an arithmetic number, because the mean of its divisors is an integer number (203200747).

Almost surely, 2^406401493 is an apocalyptic number.

It is an amenable number.

406401493 is a deficient number, since it is larger than the sum of its proper divisors (1).

406401493 is an equidigital number, since it uses as much as digits as its factorization.

406401493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 406401493 is about 20159.4020992687. The cubic root of 406401493 is about 740.7160666694.

The spelling of 406401493 in words is "four hundred six million, four hundred one thousand, four hundred ninety-three".