1154399949 has 12 divisors (see below), whose sum is σ = 1679639676. Its totient is φ = 763981632.

The previous prime is 1154399941. The next prime is 1154400047. The reversal of 1154399949 is 9499934511.

It is a happy number.

1154399949 is a `hidden beast` number, since 1 + 1 + 543 + 9 + 9 + 94 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 343175625 + 811224324 = 18525^2 + 28482^2 .

It is not a de Polignac number, because 1154399949 - 2³ = 1154399941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1154399895 and 1154399904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154399941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 466894 + ... + 469359.

It is an arithmetic number, because the mean of its divisors is an integer number (139969973).

Almost surely, 2^1154399949 is an apocalyptic number.

It is an amenable number.

1154399949 is a deficient number, since it is larger than the sum of its proper divisors (525239727).

1154399949 is a wasteful number, since it uses less digits than its factorization.

1154399949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936396 (or 936393 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 1154399949 is about 33976.4616904115. The cubic root of 1154399949 is about 1049.0240209960.

The spelling of 1154399949 in words is "one billion, one hundred fifty-four million, three hundred ninety-nine thousand, nine hundred forty-nine".