1869957049 has 9 divisors (see below), whose sum is σ = 1896397999. Its totient is φ = 1843881520.

The previous prime is 1869957043. The next prime is 1869957053. The reversal of 1869957049 is 9407599681.

The square root of 1869957049 is 43243.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 536246649 + 1333710400 = 23157^2 + 36520^2 .

It is not a de Polignac number, because 1869957049 - 2²¹ = 1867859897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1869956984 and 1869957002.

It is not an unprimeable number, because it can be changed into a prime (1869957043) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3588909 + ... + 3589429.

Almost surely, 2^1869957049 is an apocalyptic number.

1869957049 is the 43243-rd square number.

1869957049 is the 21622-nd centered octagonal number.

It is an amenable number.

1869957049 is a deficient number, since it is larger than the sum of its proper divisors (26440950).

1869957049 is an frugal number, since it uses more digits than its factorization.

1869957049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 58.

The cubic root of 1869957049 is about 1231.9995346406. Note that the first 3 decimals are identical.

The spelling of 1869957049 in words is "one billion, eight hundred sixty-nine million, nine hundred fifty-seven thousand, forty-nine".