1157821870 has 16 divisors (see below), whose sum is σ = 2132547120. Its totient is φ = 452358144.

The previous prime is 1157821859. The next prime is 1157821879. The reversal of 1157821870 is 781287511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157821879) 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, 1345875 + ... + 1346734.

It is an arithmetic number, because the mean of its divisors is an integer number (133284195).

Almost surely, 2^1157821870 is an apocalyptic number.

1157821870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1157821870 is a deficient number, since it is larger than the sum of its proper divisors (974725250).

1157821870 is a wasteful number, since it uses less digits than its factorization.

1157821870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692659.

The product of its (nonzero) digits is 31360, while the sum is 40.

The square root of 1157821870 is about 34026.7816579823. The cubic root of 1157821870 is about 1050.0595189239.

The spelling of 1157821870 in words is "one billion, one hundred fifty-seven million, eight hundred twenty-one thousand, eight hundred seventy".