1940690231 has 4 divisors (see below), whose sum is σ = 1943557512. Its totient is φ = 1937822952.

The previous prime is 1940690209. The next prime is 1940690239. The reversal of 1940690231 is 1320960491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1320960491 = 919 ⋅1437389.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940690231 is a prime.

It is a super-2 number, since 2×1940690231² = 7532557145397666722, 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 = 1940690191 and 1940690200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940690239) 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, 1432625 + ... + 1433978.

It is an arithmetic number, because the mean of its divisors is an integer number (485889378).

Almost surely, 2^1940690231 is an apocalyptic number.

1940690231 is a deficient number, since it is larger than the sum of its proper divisors (2867281).

1940690231 is an equidigital number, since it uses as much as digits as its factorization.

1940690231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867280.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1940690231 is about 44053.2658380738. The cubic root of 1940690231 is about 1247.3415996138.

The spelling of 1940690231 in words is "one billion, nine hundred forty million, six hundred ninety thousand, two hundred thirty-one".