140402431 has 8 divisors (see below), whose sum is σ = 152167904. Its totient is φ = 128774880.

The previous prime is 140402417. The next prime is 140402443. The reversal of 140402431 is 134204041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140402431 - 2¹³ = 140394239 is a prime.

It is a super-2 number, since 2×140402431² = 39425685261419522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140402399 and 140402408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140402401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32355 + ... + 36436.

It is an arithmetic number, because the mean of its divisors is an integer number (19020988).

Almost surely, 2^140402431 is an apocalyptic number.

140402431 is a deficient number, since it is larger than the sum of its proper divisors (11765473).

140402431 is a wasteful number, since it uses less digits than its factorization.

140402431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68961.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 140402431 is about 11849.1531764932. The cubic root of 140402431 is about 519.7464629412.

Adding to 140402431 its reverse (134204041), we get a palindrome (274606472).

It can be divided in two parts, 14040 and 2431, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 140402431 in words is "one hundred forty million, four hundred two thousand, four hundred thirty-one".