1099497620 has 24 divisors (see below), whose sum is σ = 2486556744. Its totient is φ = 405968256.

The previous prime is 1099497617. The next prime is 1099497629. The reversal of 1099497620 is 267949901.

It can be written as a sum of positive squares in 4 ways, for example, as 15507844 + 1083989776 = 3938^2 + 32924^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099497629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114159 + ... + 2114678.

It is an arithmetic number, because the mean of its divisors is an integer number (103606531).

Almost surely, 2^1099497620 is an apocalyptic number.

1099497620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099497620 is an abundant number, since it is smaller than the sum of its proper divisors (1387059124).

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

1099497620 is a wasteful number, since it uses less digits than its factorization.

1099497620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228859 (or 4228857 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1099497620 is about 33158.6733751518. The cubic root of 1099497620 is about 1032.1229409552.

The spelling of 1099497620 in words is "one billion, ninety-nine million, four hundred ninety-seven thousand, six hundred twenty".