1653723890 has 32 divisors (see below), whose sum is σ = 3663636480. Its totient is φ = 523376064.

The previous prime is 1653723871. The next prime is 1653723893. The reversal of 1653723890 is 983273561.

It is not an unprimeable number, because it can be changed into a prime (1653723893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907730 + ... + 909549.

It is an arithmetic number, because the mean of its divisors is an integer number (114488640).

Almost surely, 2^1653723890 is an apocalyptic number.

1653723890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1653723890 is an abundant number, since it is smaller than the sum of its proper divisors (2009912590).

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

1653723890 is a wasteful number, since it uses less digits than its factorization.

1653723890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817306.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1653723890 is about 40666.0041066245. The cubic root of 1653723890 is about 1182.5540508707.

The spelling of 1653723890 in words is "one billion, six hundred fifty-three million, seven hundred twenty-three thousand, eight hundred ninety".