405269721997 has 8 divisors (see below), whose sum is σ = 472617752000. Its totient is φ = 347374047132.

The previous prime is 405269721959. The next prime is 405269722043. The reversal of 405269721997 is 799127962504.

It is not a de Polignac number, because 405269721997 - 2³⁵ = 370909983629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405269721497) 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, 590771847 + ... + 590772532.

It is an arithmetic number, because the mean of its divisors is an integer number (59077219000).

Almost surely, 2^405269721997 is an apocalyptic number.

It is an amenable number.

405269721997 is a deficient number, since it is larger than the sum of its proper divisors (67348030003).

405269721997 is an equidigital number, since it uses as much as digits as its factorization.

405269721997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181544400 (or 1181544386 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 405269721997 in words is "four hundred five billion, two hundred sixty-nine million, seven hundred twenty-one thousand, nine hundred ninety-seven".