249999987253490 has 32 divisors (see below), whose sum is σ = 453997405523376. Its totient is φ = 99111736442880.

The previous prime is 249999987253441. The next prime is 249999987253559. The reversal of 249999987253490 is 94352789999942.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 456136793641 + 249543850459849 = 675379^2 + 15796957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 249999987253396 and 249999987253405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30379250 + ... + 37721330.

Almost surely, 2^{249999987253490} is an apocalyptic number.

249999987253490 is a deficient number, since it is larger than the sum of its proper divisors (203997418269886).

249999987253490 is a wasteful number, since it uses less digits than its factorization.

249999987253490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7372334.

The product of its (nonzero) digits is 28570268160, while the sum is 89.

The spelling of 249999987253490 in words is "two hundred forty-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-seven million, two hundred fifty-three thousand, four hundred ninety".