1042400405 has 16 divisors (see below), whose sum is σ = 1279295424. Its totient is φ = 815168640.

The previous prime is 1042400399. The next prime is 1042400419. The reversal of 1042400405 is 5040042401.

It is not a de Polignac number, because 1042400405 - 2⁶ = 1042400341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32009 + ... + 55761.

It is an arithmetic number, because the mean of its divisors is an integer number (79955964).

Almost surely, 2^1042400405 is an apocalyptic number.

It is an amenable number.

1042400405 is a deficient number, since it is larger than the sum of its proper divisors (236895019).

1042400405 is a wasteful number, since it uses less digits than its factorization.

1042400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23956.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1042400405 is about 32286.2262427804. The cubic root of 1042400405 is about 1013.9382897865.

Adding to 1042400405 its reverse (5040042401), we get a palindrome (6082442806).

The spelling of 1042400405 in words is "one billion, forty-two million, four hundred thousand, four hundred five".