40431420 has 48 divisors (see below), whose sum is σ = 125788320. Its totient is φ = 10781568.

The previous prime is 40431407. The next prime is 40431431. The reversal of 40431420 is 2413404.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 40431393 and 40431402.

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, 36897 + ... + 37976.

It is an arithmetic number, because the mean of its divisors is an integer number (2620590).

Almost surely, 2^40431420 is an apocalyptic number.

It is an amenable number.

40431420 is an abundant number, since it is smaller than the sum of its proper divisors (85356900).

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

40431420 is a wasteful number, since it uses less digits than its factorization.

40431420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74891 (or 74883 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40431420 is about 6358.5705940880. The cubic root of 40431420 is about 343.2203249736.

Adding to 40431420 its reverse (2413404), we get a palindrome (42844824).

The spelling of 40431420 in words is "forty million, four hundred thirty-one thousand, four hundred twenty".