140405420 has 12 divisors (see below), whose sum is σ = 294851424. Its totient is φ = 56162160.

The previous prime is 140405413. The next prime is 140405423. The reversal of 140405420 is 24504041.

140405420 = 1854² + 1855² + ... + 1893².

140405420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 7020271 = 140405420 / (1 + 4 + 0 + 4 + 0 + 5 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 140405392 and 140405401.

It is not an unprimeable number, because it can be changed into a prime (140405423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3510116 + ... + 3510155.

It is an arithmetic number, because the mean of its divisors is an integer number (24570952).

Almost surely, 2^140405420 is an apocalyptic number.

140405420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140405420 is an abundant number, since it is smaller than the sum of its proper divisors (154446004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140405420 is a wasteful number, since it uses less digits than its factorization.

140405420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7020280 (or 7020278 counting only the distinct ones).

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

The square root of 140405420 is about 11849.2793029787. The cubic root of 140405420 is about 519.7501511754.

Adding to 140405420 its reverse (24504041), we get a palindrome (164909461).

The spelling of 140405420 in words is "one hundred forty million, four hundred five thousand, four hundred twenty".