1290398438 has 48 divisors (see below), whose sum is σ = 2321605440. Its totient is φ = 536037264.

The previous prime is 1290398437. The next prime is 1290398441. The reversal of 1290398438 is 8348930921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1290398392 and 1290398401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290398437) 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, 584645 + ... + 586847.

It is an arithmetic number, because the mean of its divisors is an integer number (48366780).

Almost surely, 2^1290398438 is an apocalyptic number.

1290398438 is a deficient number, since it is larger than the sum of its proper divisors (1031207002).

1290398438 is a wasteful number, since it uses less digits than its factorization.

1290398438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401 (or 2394 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 1290398438 is about 35922.1162795290. The cubic root of 1290398438 is about 1088.6992980194.

The spelling of 1290398438 in words is "one billion, two hundred ninety million, three hundred ninety-eight thousand, four hundred thirty-eight".