1400540421 has 16 divisors (see below), whose sum is σ = 2134859264. Its totient is φ = 800045424.

The previous prime is 1400540389. The next prime is 1400540473. The reversal of 1400540421 is 1240450041.

It is a happy number.

It is not a de Polignac number, because 1400540421 - 2⁵ = 1400540389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400540821) 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, 67350 + ... + 85656.

It is an arithmetic number, because the mean of its divisors is an integer number (133428704).

Almost surely, 2^1400540421 is an apocalyptic number.

It is an amenable number.

1400540421 is a deficient number, since it is larger than the sum of its proper divisors (734318843).

1400540421 is a wasteful number, since it uses less digits than its factorization.

1400540421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21960.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1400540421 is about 37423.7948503355. The cubic root of 1400540421 is about 1118.8328671346.

Adding to 1400540421 its reverse (1240450041), we get a palindrome (2640990462).

The spelling of 1400540421 in words is "one billion, four hundred million, five hundred forty thousand, four hundred twenty-one".