1405142921 has 16 divisors (see below), whose sum is σ = 1785197568. Its totient is φ = 1075896000.

The previous prime is 1405142911. The next prime is 1405142923. The reversal of 1405142921 is 1292415041.

It is a cyclic number.

It is not a de Polignac number, because 1405142921 - 2¹⁰ = 1405141897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1405142923) 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, 246230 + ... + 251871.

It is an arithmetic number, because the mean of its divisors is an integer number (111574848).

Almost surely, 2^1405142921 is an apocalyptic number.

It is an amenable number.

1405142921 is a deficient number, since it is larger than the sum of its proper divisors (380054647).

1405142921 is a wasteful number, since it uses less digits than its factorization.

1405142921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498152.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1405142921 is about 37485.2360403399. The cubic root of 1405142921 is about 1120.0571083231.

Adding to 1405142921 its reverse (1292415041), we get a palindrome (2697557962).

The spelling of 1405142921 in words is "one billion, four hundred five million, one hundred forty-two thousand, nine hundred twenty-one".