1395221550 has 24 divisors (see below), whose sum is σ = 3460149816. Its totient is φ = 372059040.

The previous prime is 1395221521. The next prime is 1395221579. The reversal of 1395221550 is 551225931.

It is an interprime number because it is at equal distance from previous prime (1395221521) and next prime (1395221579).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4650589 + ... + 4650888.

It is an arithmetic number, because the mean of its divisors is an integer number (144172909).

Almost surely, 2^1395221550 is an apocalyptic number.

1395221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1395221550 is an abundant number, since it is smaller than the sum of its proper divisors (2064928266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1395221550 is a wasteful number, since it uses less digits than its factorization.

1395221550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9301492 (or 9301487 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 1395221550 is about 37352.6645635890. The cubic root of 1395221550 is about 1117.4147295666.

The spelling of 1395221550 in words is "one billion, three hundred ninety-five million, two hundred twenty-one thousand, five hundred fifty".