140637431 has 4 divisors (see below), whose sum is σ = 153422664. Its totient is φ = 127852200.

The previous prime is 140637401. The next prime is 140637437. The reversal of 140637431 is 134736041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 140637431 - 2¹⁰ = 140636407 is a prime.

It is a super-2 number, since 2×140637431² = 39557773996559522, 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 = 140637394 and 140637403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140637437) 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, 6392600 + ... + 6392621.

It is an arithmetic number, because the mean of its divisors is an integer number (38355666).

Almost surely, 2^140637431 is an apocalyptic number.

140637431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

140637431 is a deficient number, since it is larger than the sum of its proper divisors (12785233).

140637431 is a wasteful number, since it uses less digits than its factorization.

140637431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12785232.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 140637431 is about 11859.0653510300. The cubic root of 140637431 is about 520.0362782875.

The spelling of 140637431 in words is "one hundred forty million, six hundred thirty-seven thousand, four hundred thirty-one".