1391955 has 16 divisors (see below), whose sum is σ = 2260224. Its totient is φ = 731360.

The previous prime is 1391941. The next prime is 1391969. The reversal of 1391955 is 5591931.

It is an interprime number because it is at equal distance from previous prime (1391941) and next prime (1391969).

It is not a de Polignac number, because 1391955 - 2¹⁰ = 1390931 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (141264).

2^1391955 is an apocalyptic number.

1391955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1391955 is a deficient number, since it is larger than the sum of its proper divisors (868269).

1391955 is a wasteful number, since it uses less digits than its factorization.

1391955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its digits is 6075, while the sum is 33.

The square root of 1391955 is about 1179.8114256100. The cubic root of 1391955 is about 111.6542002370.

It can be divided in two parts, 1391 and 955, that added together give a triangular number (2346 = T₆₈).

The spelling of 1391955 in words is "one million, three hundred ninety-one thousand, nine hundred fifty-five".