1923400685 has 32 divisors (see below), whose sum is σ = 2470608000. Its totient is φ = 1433327616.

The previous prime is 1923400657. The next prime is 1923400697. The reversal of 1923400685 is 5860043291.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1923400685 - 2²⁶ = 1856291821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1491521 + ... + 1492809.

It is an arithmetic number, because the mean of its divisors is an integer number (77206500).

Almost surely, 2^1923400685 is an apocalyptic number.

It is an amenable number.

1923400685 is a deficient number, since it is larger than the sum of its proper divisors (547207315).

1923400685 is a wasteful number, since it uses less digits than its factorization.

1923400685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1923400685 is about 43856.5922638775. The cubic root of 1923400685 is about 1243.6263695031.

The spelling of 1923400685 in words is "one billion, nine hundred twenty-three million, four hundred thousand, six hundred eighty-five".