1023040400203 has 6 divisors (see below), whose sum is σ = 1048601197172. Its totient is φ = 998088193680.

The previous prime is 1023040400149. The next prime is 1023040400219. The reversal of 1023040400203 is 3020040403201.

It is not a de Polignac number, because 1023040400203 - 2²¹ = 1023038303051 is a prime.

It is a super-2 number, since 2×1023040400203² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023040400243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304293501 + ... + 304296862.

Almost surely, 2^{1023040400203} is an apocalyptic number.

1023040400203 is a deficient number, since it is larger than the sum of its proper divisors (25560796969).

1023040400203 is an frugal number, since it uses more digits than its factorization.

1023040400203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608590445 (or 608590404 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 1023040400203 its reverse (3020040403201), we get a palindrome (4043080803404).

The spelling of 1023040400203 in words is "one trillion, twenty-three billion, forty million, four hundred thousand, two hundred three".