1406404997 has 4 divisors (see below), whose sum is σ = 1406693676. Its totient is φ = 1406116320.

The previous prime is 1406404939. The next prime is 1406405047. The reversal of 1406404997 is 7994046041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7994046041 = 3517 ⋅2272973.

It can be written as a sum of positive squares in 2 ways, for example, as 1131044161 + 275360836 = 33631^2 + 16594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406404997 - 2¹⁸ = 1406142853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406404927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136904 + ... + 146817.

It is an arithmetic number, because the mean of its divisors is an integer number (351673419).

Almost surely, 2^1406404997 is an apocalyptic number.

It is an amenable number.

1406404997 is a deficient number, since it is larger than the sum of its proper divisors (288679).

1406404997 is an equidigital number, since it uses as much as digits as its factorization.

1406404997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288678.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1406404997 is about 37502.0665697239. The cubic root of 1406404997 is about 1120.3923468629.

The spelling of 1406404997 in words is "one billion, four hundred six million, four hundred four thousand, nine hundred ninety-seven".