1099749378 has 32 divisors (see below), whose sum is σ = 2707076736. Its totient is φ = 290043648.

The previous prime is 1099749377. The next prime is 1099749383. The reversal of 1099749378 is 8739479901.

It is a super-2 number, since 2×1099749378² = 2418897388822773768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1099749373) 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, 1006551 + ... + 1007642.

It is an arithmetic number, because the mean of its divisors is an integer number (84596148).

Almost surely, 2^1099749378 is an apocalyptic number.

1099749378 is an abundant number, since it is smaller than the sum of its proper divisors (1607327358).

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

1099749378 is a wasteful number, since it uses less digits than its factorization.

1099749378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014218.

The product of its (nonzero) digits is 3429216, while the sum is 57.

The square root of 1099749378 is about 33162.4694195110. The cubic root of 1099749378 is about 1032.2017118934.

The spelling of 1099749378 in words is "one billion, ninety-nine million, seven hundred forty-nine thousand, three hundred seventy-eight".