1209157870 has 8 divisors (see below), whose sum is σ = 2176484184. Its totient is φ = 483663144.

The previous prime is 1209157843. The next prime is 1209157877. The reversal of 1209157870 is 787519021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209157877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60457884 + ... + 60457903.

It is an arithmetic number, because the mean of its divisors is an integer number (272060523).

Almost surely, 2^1209157870 is an apocalyptic number.

1209157870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1209157870 is a deficient number, since it is larger than the sum of its proper divisors (967326314).

1209157870 is a wasteful number, since it uses less digits than its factorization.

1209157870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120915794.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 1209157870 is about 34772.9473873010. The cubic root of 1209157870 is about 1065.3549684812.

The spelling of 1209157870 in words is "one billion, two hundred nine million, one hundred fifty-seven thousand, eight hundred seventy".