1555400423 has 2 divisors, whose sum is σ = 1555400424. Its totient is φ = 1555400422.

The previous prime is 1555400419. The next prime is 1555400437. The reversal of 1555400423 is 3240045551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1555400423 - 2² = 1555400419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555400443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777700211 + 777700212.

It is an arithmetic number, because the mean of its divisors is an integer number (777700212).

Almost surely, 2^1555400423 is an apocalyptic number.

1555400423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555400423 is an equidigital number, since it uses as much as digits as its factorization.

1555400423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1555400423 is about 39438.5651742048. The cubic root of 1555400423 is about 1158.6370295224.

Adding to 1555400423 its reverse (3240045551), we get a palindrome (4795445974).

The spelling of 1555400423 in words is "one billion, five hundred fifty-five million, four hundred thousand, four hundred twenty-three".