1157644 has 12 divisors (see below), whose sum is σ = 2039184. Its totient is φ = 575024.

The previous prime is 1157641. The next prime is 1157669. The reversal of 1157644 is 4467511.

1157644 = T₈₇₇ + T₈₇₈ + T₈₇₉.

It is not an unprimeable number, because it can be changed into a prime (1157641) 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, 199 + ... + 1534.

It is an arithmetic number, because the mean of its divisors is an integer number (169932).

2^1157644 is an apocalyptic number.

1157644 is the 879-th centered triangular number.

It is an amenable number.

1157644 is a deficient number, since it is larger than the sum of its proper divisors (881540).

1157644 is a wasteful number, since it uses less digits than its factorization.

1157644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904 (or 1902 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 1157644 is about 1075.9386599616. The cubic root of 1157644 is about 105.0005744489. Note that the first 3 decimals are identical.

The spelling of 1157644 in words is "one million, one hundred fifty-seven thousand, six hundred forty-four".