1406621661 has 16 divisors (see below), whose sum is σ = 1977254400. Its totient is φ = 887020848.

The previous prime is 1406621659. The next prime is 1406621729. The reversal of 1406621661 is 1661266041.

It is a happy number.

It is not a de Polignac number, because 1406621661 - 2¹ = 1406621659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406621611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18840 + ... + 56286.

It is an arithmetic number, because the mean of its divisors is an integer number (123578400).

Almost surely, 2^1406621661 is an apocalyptic number.

It is an amenable number.

1406621661 is a deficient number, since it is larger than the sum of its proper divisors (570632739).

1406621661 is a wasteful number, since it uses less digits than its factorization.

1406621661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38128.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1406621661 is about 37504.9551526195. The cubic root of 1406621661 is about 1120.4498779969.

The spelling of 1406621661 in words is "one billion, four hundred six million, six hundred twenty-one thousand, six hundred sixty-one".