253990997 has 8 divisors (see below), whose sum is σ = 273664440. Its totient is φ = 234336960.

The previous prime is 253990991. The next prime is 253991009. The reversal of 253990997 is 799099352.

253990997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15319396 + 238671601 = 3914^2 + 15449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 253990997 - 2¹⁰ = 253989973 is a prime.

It is a super-2 number, since 2×253990997² = 129022853114108018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253990991) 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, 33779 + ... + 40607.

It is an arithmetic number, because the mean of its divisors is an integer number (34208055).

Almost surely, 2^253990997 is an apocalyptic number.

It is an amenable number.

253990997 is a deficient number, since it is larger than the sum of its proper divisors (19673443).

253990997 is a wasteful number, since it uses less digits than its factorization.

253990997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9703.

The product of its (nonzero) digits is 1377810, while the sum is 53.

The square root of 253990997 is about 15937.0949987757. The cubic root of 253990997 is about 633.2950706032.

The spelling of 253990997 in words is "two hundred fifty-three million, nine hundred ninety thousand, nine hundred ninety-seven".