1406667631 has 4 divisors (see below), whose sum is σ = 1411638472. Its totient is φ = 1401696792.

The previous prime is 1406667623. The next prime is 1406667637. The reversal of 1406667631 is 1367666041.

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

It is a cyclic number.

It is not a de Polignac number, because 1406667631 - 2³ = 1406667623 is a prime.

It is a super-2 number, since 2×1406667631² = 3957427648206304322, 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 (1406667637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2484996 + ... + 2485561.

It is an arithmetic number, because the mean of its divisors is an integer number (352909618).

Almost surely, 2^1406667631 is an apocalyptic number.

1406667631 is a deficient number, since it is larger than the sum of its proper divisors (4970841).

1406667631 is an equidigital number, since it uses as much as digits as its factorization.

1406667631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970840.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 1406667631 is about 37505.5679999650. The cubic root of 1406667631 is about 1120.4620837238.

The spelling of 1406667631 in words is "one billion, four hundred six million, six hundred sixty-seven thousand, six hundred thirty-one".