1249398658 has 16 divisors (see below), whose sum is σ = 1928076696. Its totient is φ = 606837760.

The previous prime is 1249398653. The next prime is 1249398671. The reversal of 1249398658 is 8568939421.

It can be written as a sum of positive squares in 4 ways, for example, as 326271969 + 923126689 = 18063^2 + 30383^2 .

It is a super-2 number, since 2×1249398658² = 3121994013224401928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1249398599 and 1249398608.

It is not an unprimeable number, because it can be changed into a prime (1249398653) 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, 13591 + ... + 51802.

Almost surely, 2^1249398658 is an apocalyptic number.

1249398658 is a deficient number, since it is larger than the sum of its proper divisors (678678038).

1249398658 is a wasteful number, since it uses less digits than its factorization.

1249398658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65669.

The product of its digits is 3732480, while the sum is 55.

The square root of 1249398658 is about 35346.8337761673. The cubic root of 1249398658 is about 1077.0445770329.

The spelling of 1249398658 in words is "one billion, two hundred forty-nine million, three hundred ninety-eight thousand, six hundred fifty-eight".