1025400999 has 24 divisors (see below), whose sum is σ = 1591826688. Its totient is φ = 585424560.

The previous prime is 1025400991. The next prime is 1025401051. The reversal of 1025400999 is 9990045201.

It is not a de Polignac number, because 1025400999 - 2³ = 1025400991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025400991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216244 + ... + 220934.

It is an arithmetic number, because the mean of its divisors is an integer number (66326112).

Almost surely, 2^1025400999 is an apocalyptic number.

1025400999 is a deficient number, since it is larger than the sum of its proper divisors (566425689).

1025400999 is a wasteful number, since it uses less digits than its factorization.

1025400999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6195 (or 6188 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 1025400999 is about 32021.8831270118. The cubic root of 1025400999 is about 1008.3963044312.

The spelling of 1025400999 in words is "one billion, twenty-five million, four hundred thousand, nine hundred ninety-nine".