1955400605 has 16 divisors (see below), whose sum is σ = 2551662000. Its totient is φ = 1432507392.

The previous prime is 1955400553. The next prime is 1955400611. The reversal of 1955400605 is 5060045591.

It can be written as a sum of positive squares in 8 ways, for example, as 116877721 + 1838522884 = 10811^2 + 42878^2 .

It is not a de Polignac number, because 1955400605 - 2¹⁶ = 1955335069 is a prime.

It is a congruent number.

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, 307730 + ... + 314019.

It is an arithmetic number, because the mean of its divisors is an integer number (159478875).

Almost surely, 2^1955400605 is an apocalyptic number.

It is an amenable number.

1955400605 is a deficient number, since it is larger than the sum of its proper divisors (596261395).

1955400605 is a wasteful number, since it uses less digits than its factorization.

1955400605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621808.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1955400605 is about 44219.9118610610. The cubic root of 1955400605 is about 1250.4852739829.

The spelling of 1955400605 in words is "one billion, nine hundred fifty-five million, four hundred thousand, six hundred five".